You can now sync your iphone /ipod touch / iPad (where's mine btw?) over wifi. Whoop!http://www.getwifisync.com/
You need to buy a $10 cydia app, unless you wanna crack it, but I didn't risk it. Therefore you need a jailbroken device.
Works really nicely, and very quick. I can't see a difference between USB speed and wifi speed (iTunes is generally a dog anyway)