One of the very new ‘PC Free’ features of iOS 5 is Wi-Fi sync – wireless sync between your iPad or iPhone and your PC.
This will allow you to keep photos and videos, music, and apps in sync without having to connect your iPad to your PC via the sync /charge cable.
Once this feature is enabled, every time you connect your iPad to a power source it will automatically sync and and backup any new content purchased on the iPad to iTunes. You can also manually force a sync by going to Settings > General > iTunes Wi-Fi Sync and tapping ‘Sync Now’.