This thing

[dragonsgames]

http://www.watch.impress.co.jp/av/docs/20041006/ez08.jpg
Can you charge through just USB?

[hope]

That's an attachment that came with a few clies, the TH if I'm not mistaken. If you look at the picture you will notice the right side has the power input while that miniusb is for the hotsync. You put both connection into it so you just have one plug into your PDA.

[dragonsgames]

It comes with the VZ90...
I had one with my TG and NX. I never got to test if you could charge through just USB.

[Seymour]

All, the majority of the Clie family use these connectors.

[Cyker]

You can't - The USB pins only connect to Data, and the power pins goto, well, power :)

You CAN however, buy a thirdparty cable which delivers USB power to the port.