Evernote: Forever, forever, ever.
In short, Evernote wants to be your mobile brain. Pretty ambitious of them since my brain has a lot stuff in it; granted, a good chunk of that will only win me bar bets or games of Trivial Pursuit… there’s work stuff too but NDA’s say ‘no’ about posting that sort of thing. At it’s core Evernote is essentially an online filesystem like MobileMe’s iDisk or Gmail’s GDrive, but with a few nice extras.