Started something similar over at the French boards:
Thread 1 - discussions
Thread 2 - comic thread
I was attempting to start a "party thread" (like they have roughly every quarter over at MT A&D) whereas all artists participate on the same story (a free-for-all arena fight with multiple characters).
Every artist retained full scenaristic and artistic control for 2 to 3 pages before passing it on to the next self-appointed artist.
It started off great, with lots of interest from the French community. Lots of brainstorming (like character sheets with AT, powersets and character traits descriptions)
Then after four pages, people got sidetracked by I12 or RL stuff.
It's not dead yet but if I learned anything, is that people may lose interest or passion for an collaborative idea pretty fast. Make sure that whoever joins is pretty committed.
I'd be willing to lend my writing skills (pathetic as they may be) to this project.
*Puts hand up* I'd like to help out with the writing 
If there were several artists wouldnt the comic be done in different styles? I think that would be cool but others might find it annoying that the style kept changing.
Okay, silly of me to put two ideas in one post, so Ive split them.
Ive just been reading through the stuff Swissy started on the French forums. Its very good (as ever ) and I recommend a look even if you dont read French that well. The co-op comic would be slightly different, I guess and I dont think style would be a problem (certainly not looking at the French stuff).
Some further thoughts: Could we have separate writers, artists and letterers? Could we even have letterers for the three languages? Making it cross community might be a good way to access more artists and spread out the workload.
Ill leave further comment for BuringFist (over the weekend) as it was his idea, I just wanted to bring it to the attention of everyone as I thought it was good.
Presume its not going to be too much work for anyone and therefore put your name down even if you would only have the time to chip in a story idea or do a couple of drawings once a month, say.
Sounds like a great idea!
I read the French ones Swissy had on his site a while ago and wondered why we hadn't started one of the UK boards yet.
I would definitly put my name down for colours, or even the artwork!
Catz
There's some good points and good ideas on this thread already. This will look like a lot of writing but please read on if you're interested in participating. And don't let it scare you off 
The trick will be to get as many people as realistically involved as possible while keeping everyone's input as manageable as we can (losing interest is a common problem with long-term internet projects, as Swissy points out) while maintaining consistency across everyone's efforts.
Maybe one approach would be to pair up an artist with a writer and give each pair a single thread (featuring just one or two characters) in an overall story arc which draws all threads and characters together for the climactic finale.
This way individual art and writing styles would have enough room to breathe and develop, and if a writer/artist pair need to drop out they'd be able to wrap their thread up without stalling the project.
I guess this would need one or more writers to develop the overall storyline. Fewer writers would be better in this role as collaboration between too many could become too slow and bogged down with discussion and conflicting ideas etc.
The overall story could even be "dripped" to the artist/writer pairs giving them things to respond to in their own arcs. This would work similar to how a GM works with players in a P&P RPG, where the GM would be the overall story-writers and the players the artist/writer pairs. As in a P&P RPG the trick would be to give the artist/writer pairs enough freedom to develop their own threads while keeping them all focused on a single story. It would also help keep the individual threads dynamic while (hopefully) keep everyone's interest by making it bit of a game too.
Now, this would obviously be a lot of work, especially for the artists (although having separate letterers, colourers and 'inkers' would help them a lot). Also, creative collaborations can get pretty fraught so it'd be important for everyone to do work together with as little ego as possible and always put the project first. We'd also need to jointly establish some firm deadlines to keep things moving along and it'd be important for everyone to factor RL commitments and such into the amount of work they can do per deadline phase.
I have no idea how or even if this will work. All I know is that there's a ton of talent on these boards and would be great if somehow we could bring it all to bear in a joint effort.
I haven't thought much of this through and there are some issues that I definitely haven't considered, so if anyone has any comments, ideas or anything else to add, please feel free to post 'em.
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<snip> We'd also need to jointly establish some firm deadlines to keep things moving along and it'd be important for everyone to factor RL commitments and such into the amount of work they can do per deadline phase.<snip>
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There lies a major problem and this is when it gets real tricky to organize such an event.
I am not criticising your view of this project but simply underlining that terms like "firm deadlines" instantly kills the idea of fun and fun is what, in my opinion, should drive a project.
From where I stand, I have enough daily life and work "commitment" to keep me going for a while.
Now maybe that's just me and maybe I suck at planning my free time. I can dig that.
Anyway, my point is that imposing deadlines and holding a "schedule" could (and I stress -could-) have a reverse effect.
my other 2 cents
Fair point, my main reason for mentioning deadlines was to keep things moving but as you say it could make it feel more like work than what it should be.
I don't have any firm ideas on any of this by the way, I got in from work and basically splurged a load of stuff out, stream of conscious style, to get the ball rolling a bit
Heh, same here to be honest :P
It could also be done along the lines of IDWs Transformers Mosaics. The story is limited to 1 page so doesn't demand too much time on the part of the creators, and that way more people have the opportunity to get involved. Thoughts?
i'd be up for taking part in this too, should anyone want to use my wobbly style.
in my opinion, it's have to start with the writers agreeing on a 'plot leader', who, in agreement with the other writers, thrashes out a basic plot for the strip to follow. the writers then parcel up the story between themselves, with one acting as a kind of russell t davies plot overlord. then the pages get pm'd off to us poor colouring in types, who get to ignore the stoopid words and do some pretty pictures.
since i am so lazy, i'd also suggest that the artists only commit to one or two pages per round?
@Doctor Destiny
...from the Ryman League of posters
http://drdestiny.deviantart.com/
blog-thing
Co-op Comic
BurningFist mentioned this in another post and I thought it deserved a new thread (source):
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On a barely related note I had a potentially great idea earlier on - maybe the writers and artists on the forum could get together and knock together a comic or two between us?
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So, as an idea this sounds great and as a writer Id certainly love to do some of the scripting. Im guessing it will be more work for the artists, so its really down to those who are interested and have the time to put their hands up. Unless its going to be done with stick men, then leave it with the text guys.
[edit: moved the Rolling Story to another post.]