Only seen KeePass Droid so far. It looks like you need to create initial database on a pc and download to device, but should good when its complete. They have versions for winmo, blackberry, symbian so think it wont be long before its fully functional.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?