Good news! PlayerPal for iTunes remote control is now in Beta! The Beta software was distributed yesterday and already feedback has been coming in. No bugs yet, just feature requests. Phew.
PlayerPal for iTunes does not run as a service like the WMP version. Aside from that it provides exactly the same browser interface but with iTunes as the engine rather than Windows Media Player.
There will be a second Beta after this release. If you would like to participate in the testing please email itunesbeta@playerpal.com.
Updated 24/2/2006: for iTunes copyright reasons.