[edit: I will test it again, perhaps with a new power supply.]
The Apple iPad does not charge via a Windows PC’s USB. ASUS provides an application called Ai Charger which directs ASUS motherboards to push more energy through USB to properly charge an iPad. I have an Asus P5B motherboard and 450W power supply on my homebrew computer. When I installed this iTunes could no longer synch nor recognize my iPad. Even after uninstalling the Charger I could not get iTunes to consistently recognize my iPad. On the rare occasion that it did, the backup process went for 12 hours before I finally killed it and gave up. The Level 2 support at Apple couldn’t figure it out and said repeatedly that he’d call me back within 48 hours with an engineer to work this out. A month passed and I’d given up. Finally, iTunes 10 came out and my iPad synchs again. Yay! I just now installed Ai Charger again and it caused the same damn problem. Thankfully, I uninstalled Charger and my iPad synchs again. I hope someone somewhere comes up with a powered USB hub that will charge the iPad, because ASUS software
is lousy crap doesn’t work for me.