WiFi Sync, is a popular 3rd party application that lets you sync your iOS devices with iTunes wirelessly. The developer announced that v2.0 is coming in December and will let you sync via Wi-Fi, 3G, EDGE and/or VPN.
The 2.0 update will be free for existing users; however, the 3G sync feature will be a $5 in-app purchase (it needs server capacity).
WiFi 2.0 changelog:
Sync your iPhone over Wi-Fi, 3G, EDGE and/or VPN
Major stability and speed improvements
Native support for iPad & iPod touch 4G
Direct integration with iTunes
Wi-Fi Sync v1.1 is still available in Cydia Store for $9.99.
NOTE: WiFi Sync breaks firmware restore/upgrades. You can find a tutorial on how to fix this issue here…