iSofa, wifiTunes, Signal ($30) etc… will be swept way when iTunes 7.7 will be released.
The beta version Apple is seeding to developer comes with a bundled application that will allow you to that.
It should be released maybe today or tomorrow (because the iPhone 3G will be shipped on june 29th) or in two weeks maximum (MobileMe release date july 11th).

Beyond the new remote functionality, iTunes 7.7 is also known to add an Applications tab to let users specify loading only certain software on the phone, and will be necessary for both iPhone 3G and the MobileMe sync service.

Posted in iPhone, iPhone 3GS & iPhone 4, iPod & iPod Touch, iTunes