The secret to all of this is the NDK, assuming you're okay with the KeePass 1.x file format. (KeePass2 is a .NET app, so its not so easy to port.)
You see, the portable KeePass version, KeePassX, is a Qt application. Given the NDK, getting Qt to work on the PlayBook will not be very hard. (Qt 4.8 added a whole new integration infrastructure piece that will make it quite easy, actually.)
So, if we port Qt to the PlayBook, and then recompile KeePassX (after porting its clipboard-management code), make a few touchscreen UI tweaks, I think its obvious what I'm getting at here.
I'm working on a KeePass port for the PlayBook named kiPass, so far I can access a KeePass DB on the PlayBook in read-only mode, but I hope to progress quickly from now on to a full featured KeePass app for the PlayBook.
I'm hoping to get KeePassX ported and usable to a "good enough" level, and made available in some form after the NDK goes public. However, being primarily a desktop app, the current version of KeePassX will still be somewhat awkward on the PlayBook from a usability perspective. (KeePassX 2 may improve on that, but its been in development limbo for so long that I have little confidence in it getting finished in the foreseeable future.)
So I'd definitely be interested in a KeePass-compatible app that's actually designed for the touchscreen UI of the PlayBook, and hope kiPass makes good progress.
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