Last week, OCZ announced another addition to their quickly expanding flash drive offerings. They have introduced the "Diesel" USB 2.0 Flash drives, which will rival entry-level SSDs in terms of capacity with the units going as high as 16GB. The units will also be available in 2GB, 4GB and 8GB versions. 16GB in your pocket is certainly a way to carry a lot of data around very quickly, and it's no larger than a regular USB flash drive. They don't play up extreme speeds with this unit like they did with the Spyder drives they also announced last week, so odds are you'd be dealing with more normal transfer speeds.
You can read about the units on the OCZ product page or in the press release. Prices for the units are not mentioned specifically, but they will probably be cheaper per gigabyte than the "performance" flash drives available.