eSATA flash drives, but OCZ is entering the fray with the Throttle, which looks a lot like the Ao-Lab unit we saw back in October. No pricing or release date is given, but Register Hardware estimates it'll be $32 for the 8GB model, $56 for 16GB and $160 for 32GB. For eSATA ports that don't provide power, the Throttle has a mini-USB port to give it some electrical juice that can also be used to transfer data, which should cover most scenarios unless you're at a phantasmagorical computer that somehow has only FireWire ports.
[Via Maximum PC; thanks, Havok]
Read - Official press release
Read - OCZ readies USB eSATA Flash drive (Register Hardware)