Update : Version 1.1 released ! No crack yet...
Download 1.0 : Official or 4shared
You can now wirelessly sync your iPhone with iTunes using Wi-Fi Sync, a new app for your jailbroken iPhone.
Run the app on your phone, and it'll appear in iTunes' list of connected devices. From there you can sync music, apps, photos, contacts and everything else just as if it were plugged in via USB.
The app is currently compatible with Mac OS X 10.5 and 10.6, and a Windows version will be available shortly.
You can download the free Mac software (required) from getwifisync.com
. This app is not supported on the iPad.