Does anyone here have any recommendations/suggestions on using a USB stick to store private data (as in everything from passwords to sites to social security numbers and bank account numbers)? Needless to say, I'm looking for something secure.

For my desktop, I use RoboForm (commercial), which lets me choose between AES, BlowFish, and RC6 (I have it set, of course, to use Belgium's best export product since the exodus of myself). I'm extremely pleased with RoboForm (can't beat those features), and it has a portable version specifically designed for USB sticks (with the same features), included in the price.

So why ask? RoboForm is commercial and proprietary, and thus the implementation of the algorithms cannot be verified. Not that I would know whether or not they had been properly implemented if allowed to verify, but anyway...

Other alternatives I have come across: Schneier's Password Safe (using TwoFish), and KeePass (using AES or TwoFish).

Any advice? What are the risks involved (other than the NSA suddenly growing an interest in my private data, or border representatives demanding I tell them the password)?