They all link to the old boards, hence 404 error. I did a really bad search for the guides (Search function: it's your friend! 
), and here's Blazeblast's (the only actual dark/dark guide): One.
And it's not corrs, but here's a random dark/dark defender guide. The powers are the same, just different damage and buff/debuff rates. Two!
And two more half dark guides, just...cause. Dark/Coooooold. And screaming/darkity dark dark.
Dark/Dark is a good, solid combo. Very hard to go wrong with it. Any particular questions you have about it, or just want to look at other people's ideas?
Thank you!!
I have been searching for this guide all week!
Cheers,
Prestige X
Cant seem to find one that dosent give me a 404 error. anyone know of a guide thats current or have a solo build I can look at? :P