USB "thumb" drives with flash memory have reached 4 GB -- and for under $100. And if you need more storage, USB pocket drives based on tiny hard drives how now reached 12 GB -- a bit bigger then a flash drive, but still under a couple ounces.
The Memorex Mega TravelDrive is now available from 4 GB for $119, to 6 GB for $99, 8 GB for $129, and 12 GB for $149.
And the Verbatim Store'n' Go USB HD Drive reaches to 8 GB for $135, and 12 GB for $179, in an even smaller design.
See more in the Portable Storage Gallery, under USB Hard Disk Pocket Drives.