Yep. You'll find them in 32mb, 64mg, 128mb, 256, 512 and 1gig+. You SHOULD be able to just plug them into the USB drive and have it show up as a drive letter. Just a warning that if you happen to be running Windows ME, it probably won't work. One of my PCs is still running ME and hardly anything shows up when it's a USB device (and it's a known bug with ME).
Kimya