I like a password manager that can share the same data format with my handheld and also my desktop. That makes it easier to pass the same file of passwords between devices. I use KeePass on the desktop, so I would love KeePass on a handheld device (with a handheld-friendly interface). But in Maemo5 I know there is Password Safe. For Diablo/OS2008 there is PasswordSafe, Personal password manager, and TrustMe (which has the ability to convert between KeePass and its format via a separate utility).