[vwinsyee]

>Something else I just thought of while typing this is that this would make an awesomely sci-fi means of information storage. No need to remember a password, we've encoded your gut flora with your private key!

First occurred to me as interesting too. Then I realized that you'd be dropping your private key in every toilet you defecate into. Not to say that secure intra-body information storage isn't possible though.

Then again, re: the steganography -- gut flora's pretty diverse (and there's a lot of it). People might not necessarily think to, or want to, dig through your shit.