It will be better than looking away from the screen to find my note pad to take notes of what is being said to one of my characters for future reference. Doing that usually means I miss something important. 
Credit goes to FrankyT49 for animated avatar
List of toons on Union Handbook
Leon Tasker: "Dunelm Group! What is your profession?"
Dunelm Group: "OOOOORRRAAAAH!"
Luckily for me (and those that make use of this), I'm blessed with amazing memory.
The (small) gaps in memory are easily explained as natural over sight in memory of the character.
That said, I might use it to sort out which of my characters met certain characters... if I remember to use it 
@ShadowGhost & @Ghostie
The Grav Mistress, Mistress of Gravity
If you have nothing useful to say, you have two choices: Say something useless or stay quiet.
I'm not sure how i'll use them!
Probably to identify characters, Lets see, an example would be;
"Character: Miss Bubbles - That bubbly girl, likes milkshakes, has piercings on her eyebrow, tattoo of a dice on left arm."
Things that aren't ingame that can be easy to forget. 
Names.. Must be names.
I remember names but I always get the "Argh.. What was their name again..I know it but i'm not to sure!"
Maybes ages or something else. Dunno yet
Catz
I'm going to use it to keep track of in-game Catz's partners. I do hope it'll read a 500gb text file... 
@FloatingFatMan
Do not go gentle into that good night.
Rage, rage against the dying of the light.
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I'm going to use it to keep track of in-game Catz's partners. I do hope it'll read a 500gb text file...
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Always picking on me Floaty Maybes I should note how many times you've used Catz's relationships as a Pun.
Catz
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I'm going to use it to keep track of in-game Catz's partners. I do hope it'll read a 500gb text file...
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Always picking on me Floaty Maybes I should note how many times you've used Catz's relationships as a Pun.
Catz
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You could join in our running joke and point out that I often function as FFM's memory
Hopefully, now I won't have to do so as often 
@ShadowGhost & @Ghostie
The Grav Mistress, Mistress of Gravity
If you have nothing useful to say, you have two choices: Say something useless or stay quiet.
For me, names, obscure details, minor powers, special senses, anything that my character has been told or should be able to see. No more hastily double-checking the Union Wiki for me.
Knights Exemplar: Wolfram, Autumnfox, Starlit Spirit.
Militia: The Portent, Wavekite, Mr. Sandman.
The Cadre: WarpLocke, Zajin.
Numerous others.
For Onus her nicknames for everyone. Also a few minor details that I should remember!
I'll be using Player Notes like Graffiti Post-Its. Tagging my shopping list onto random strangers, adding Shakespearean poems to greifers and then when I've tagged everyone I'll spend then next 3 years trying to find them all again.
It takes Chaos to move the world to Action.
Probably for char's 'real' names, odd notes about what was discussed and when, important things to remember and notes on whether to headhunt the player to join the NHU... Wait... Did I type that in silence? *gentle thought*
Anyways back on track.
Char aliases, appearance details, known associates and that kind of thing. My memory is terrible for all of the above, especially in the real world.
Hey Devs, can we have something like this for the real world? Sticking post-it notes to people's foreheads might get me a bloodied nose.
So, with i12 we now have the option to add personal Player Notes to other characters. Apparently these are stored locally on your own PC and so will only be available to you.
The primary way I can se these being used is by RPers to record notes about relationships to specfic characters and other memory aids for help during RP (although I was bound to see it from an RP PoV I guess!)
What about the rest of you? Do you see these as a bonus to play? Will you both using them? Are they a bonus to consistant RP, or will you use them in a different way?
Formerly @Crimson Archer, now @CA
The Militia - Protecting Paragon City through roleplaying since June 2006!