One app that I really want for my iPhone is iKeePass, an port of the KeePass password safe. I’ve mentioned it before. I’m up to about 400 entries now. It’s completely indispensable to me for keeping track of not just passwords, but identities, and which websites I’ve registered on.
Apple is holding up approval of iKeePass, apparently indefinitely. It seems to be some combination of not wanting to approve strong encryption for export and hangups about open source. Or something. Whatever it is, it’s damned annoying.
KeePassX works on Mac and Linux and means that I can move my password database back and forth to Windows without problem. Only my iPhone is without some form of KeePass.