[youtube]http://www.youtube.com/watch?v=-5P3G7em4JI[/youtube]
Control your DAW and hardware synths wirelessly via OSC with Pianist Pro. Use Pure Data (a free application for both OSX and Windows) on your PC to receive the OSC calls and translate them into MIDI messages to suit your setup.
<a href="http://dailyiphoneblog.com/2010/07/16/ipad-wireless-midi-via-osc-using-pianist-pro/">

[Read the original blog post]
</a>