i have notes scattered around evernote, dropbox, index cards, moleskines, iOS notes. i think it's time to compile them into a spark file!
More importantly, I didn't have any habit for reviewing them. Hope it helps you like it helped me!
On a slight tangent, I'm looking for something more touch screen appropriate that I can sync with git (must be text based, preferably compatible with org-mode). While I have Emacs, org-mode and git on the current phone with a hardware keyboard, that won't last forever, and I really need something that makes for very quick idea capture on a touchscreen. Bonus points for something that also tracks/logs time, manages todos and calendars (ideally, I suppose it would be org-mode optimized for a touch screen).
EDIT: Yes, I know about MobileOrg (http://orgmode.org/manual/MobileOrg.html) and while it's close (oh, so close), it's not quite close enough (notably, it's lacking logging of time spent on tasks). Although, since it is open source . . .