Apple needs to consider wireless sync with iTunes based on the fact that the USB port does not provide enough power to charge the iPAD. I now have to charge using the wall charger then unplug this to sync with itunes then of course back again. Zune has had wireless sync over wifi since day one. OS4.0 wish list.
Charging from the USB port depends on the computer you are using. The iPad needs a high power USB port to support charging while it is running, so not every computer can do that. However, in most cases, when the iPad is asleep & plugged in, it will charge (albeit slowly) on those same ports.