A trip to Fry's this afternoon and a chance encounter with a Lexar Lightning USB drive reminded me of an idea I had to RAID together USB flash drives. HardForum has a nice discussion and a reminder of throughput. USB is 480 Mbps (60 MB/s) and the fastest Flash is about 30-40 MB/s. Meanwhile, IDE is 133 MB/s. With regards to USB flash speeds, there is a difference. See the Moka5 USB Flash Drive Showdown for ratings. There are substantial differences between products. Pricing also varies substantially by site. The 2GB Lexar Lighting was $54.99 at Frys.