Enagadget has posted an article to a YouTube video posted by an iPhone developer showing him syncing an iPhone to iTunes on a Mac wirelessly, using an application called Wi-Fi Sync.
According to the developer's comments, he believes that the app follows all of Apple's App Store guidelines and will be submitting the application to Apple for approval later this week.
The application also requires a syncing application to be installed on the computer you would like to connect the iPhone or iPod touch to. The video shows a Mac version of this application, but the developer promises a Windows version would be coming soon.

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[...] developer has already tried to bring wireless syncing to the iDevice family, an app he called Wi-Fi Sync. As many expected, that app was rejected by Apple. However, the developer put the application in [...]
[...] may remember last year that we reported on a new jailbreak tweak released by developer Greg Hughes that allows for wireless syncing of iOS [...]