Grist did a quick profile on it and, if you're interested, a 7-minute video follows as well. A bit pricey ($5,495), but about as low impact as travel can be.
Specs in a nutshell:
The ELF can go up to 30 mph and carry up to 350 pounds, but doesn’t need any of that pesky car stuff like a license plate, insurance, or actual gasoline. The battery’ll charge in 90 minutes when plugged in, carrying you up to 14 miles — farther if you put your thighs to work.