I have a bunch of supplementary material stuff in Natasha's journal, including the beginnings of a CR chart, and some quotes, and a list of arcs, stuff like that, but that is mostly because I wanted to format everything, not because it would help me RP.

I did just install a little HTML copy/paste app, so I have a lot of my formatting tags easy.

But I am a lazy player and go mostly by memory. I think having a thread tracker, and some sort of IC notes, to keep track of what my characters would and wouldn't know, would be helpful, because I've wished I had done that occasionally! But no, I just have to make do with gmail search.