This Cydia tweak will also bring support to iPad and iPhone 4. Here's all the changes that's supposed to happen next December:
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
If you liked it, you can purchase Wi-Fi Sync version 1.1 now for $9.99 from Cydia Store and when the new version comes out, you will get it free.