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Splashtop HD is a complete remote desktop program for the iPad. It allows remote control of Windows PCs and Macs from the iPad, with a touch interface. It turns any Mac or PC into a full touch system on the iPad. Audio/video streaming works particularly well in Splashtop.
$4.99, requires a Mac or PC with Splashtop Streamer (free)
Developers working on Metro apps for Windows 8 have a good way to test the apps in a touch environment with Win8 Metro Testbed on the iPad. This new app is designed specifically for testing the Metro apps using the iPad, with the lack of Windows 8 tablets otherwise making that task difficult. It is developed by the Splashtop folks.
$24.99 (half price for a limited time, normally $49.99)
The nivio service is in beta at the time of this writing, and it provides access to a Windows desktop without the need for a system to access. It is similar to the OnLive Desktop app, with the additon of allowing the user to install third party Windows apps to the remote desktop. Once the nivio service goes live, users will rent apps they install to the remote desktop on a monthly pay-as-you-go basis.
Currently free during the beta