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OnLive Desktop brings a remote Windows desktop to the iPad, without the requirement of a remote system. It uses a remote desktop provided by OnLive that includes full versions of Microsoft Word, Excel, and Powerpoint.
Free, with a Plus option that provides priority access and adds Internet Explorer web browsing.
Mac users have long used Parallels Desktop to run various OSes in virtual machines on their Macs. Parallels Mobile lets those with virtual machines set up run them from the iPad. The operation is as smooth as butter and opens up the iPad to a nuber of OSes that can be accessed from the tablet.
$4.99, requires Parallels Desktop on a Mac for access
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)