Quite interesting. It does seem to be missing an adapter for a particularly popular portable device though, the iPod. Of course they have an iPod battery, sold separately (seems like they're trying to get money off people with laptops and iPods, twice).
The list of other supported devices is quite impressive though. Powerbook G4s, Clies, a bundle of Palms (although missing support for the three newest - T5, Treo 650, and LifeDrive), a huge number of digital cameras, etc.
"Adapters shown in red must be ordered separately for a minimum charge from the Tekkeon Store."
They're $5 each. Not bad.
Judging from the specs, though, it's basically a stand-alone laptop battery, with a little more capacity (depending). 3 hour extension to a laptop. And most laptops last 3 hours on battery. Hmmmm...
And the name... It seems a bit cheesy.