My latest Must Have gadget is the Wiebetech Firewire Keychain. I've ordered one, along with a 512MB compact flash card, with the intent off producing a fairly capacious way of keeping important data with me. OK, 512MB is overkill, but Amazon had a Viking 512MB compact flash card for $199, which is a steal. One of the main uses I have in mind for this is as a master repository of Useful Information. I want to end the hunt for serial numbers that ensues every time I do a system reinstall (esp annoying when I've got an upgrade that insists I also enter the previous version's serial). However, I don't want this information to be too easily accessible should someone steal/find my gizmo. Is there any such thing as an encrypting file system for the Mac? Right now I'm considering a number of ideas. Simplest of the lot is just a Stuffit archive with individual files encrypted, but it's a little clumsy sinec it seems to want per-file passwords. What I'd had in mind (and the documentation says can't be done) is an archive that can just have little files dropped on it with no need for passwords, but that requires a password to get at. There's no end of similar things that can be done with various Darwin tools. It's just all...clumsy. Anyone got any ideas of an elegant way to go about something like that? Al PS I don't expect to have 500MB worth of serial numbers, by the way. That'll just be one small file. The rest'll be stuff like a copy of my resume in case I ever need it, but not the sort of stuff people keep in PDAs or iPods (since I have a PDA and an iPod for this). It's too small to be an OS X boot disk too. Maybe I should have titled this thread "what interesting and useful stuff can you get in 512MB of slow storage?"