Brando has released a USB SyncCharger Extension Cable that enables standard PC/Mac USB port to charge the iPad as well as sync over the USB. It's available now and sells for $6.00.
Here is more info on this Brando USB sync and charge cable:
Features : - Charges and Hotsync iPad / iPhone 4 with USB cable - Charges and Hotsync with other USB devices - Fully support USB 2.0 - Perfect for connecting all USB Port - Compatible with both Windows and Mac platforms - Dimension: 220 x 17 x 10mm (approx.) - Weight: 14g