Techgage takes a look at OCZs latest Rally2 drive... a 4GB model.

So, you are looking for a high-density thumb drive, but
don't want to have the slow speed that usually coincides. OCZ recently launched 4GB versions of their extremely popular Rally2 thumb drives, and they prove to be a winner. Faster than most of it's competition, and cheaper to boot.

OCZ Rally2 4GB Thumb Drive Review