I don't have a cd drive on my thinkpad. Can you guys think of any OS to run like a livecd?

I found this so far: http://imil.net/wp/netbsd-livekey/

The reason I want this is to run a minimal OS on my usb-key. I have a micro-mini 1 gig key from iomega, it's pretty tiny!

I'm down for any linux, or unix variant.