The last few paragraphs may have left you with the impression that while I couldn't crack the final version of the stick, I still think it's a pile of insecure rubbish. It may then come to you as a surprise that I actually think this stick is quite usable to store secret or private documents on it. Security isn't a black-and-white matter: everything that's protected can be cracked one way or another. The idea of security is to make it more expensive to crack the protection than it is to obtain the secured data another way. When looked at it this way, it becomes apparent that some quite big secrets can be stored inside the BioSlimDisk before it gets interesting to crack it.
Another good thing is that when I informed Ritech about the loop-hole allowing just one latent fingerprint to unlock the complete stick, Ritech mailed me back that they modified their firmware to use multiple strings of private data, one for each enrolled fingerprint. The new firmware should be available at the end of October 2007. I have to say that has to be the quickest response to a vulnerability I've seen since I began cracking USB-sticks.
All in all: I think the BioSlimDisk Signature is a good way to store your private or secret data. Just make sure to swipe your finger over the sensor after use, as indicated in the manual, and don't use it to store any nuclear secrets.