Splashtop Inc. has their Splashtop HD Remote Desktop (iTunes Link) for the iPad in the iTunes App Store for $2.99 (regularly $19.99) for limited time.

This is the ONLY remote desktop app that streams video and audio from your PC or Mac, allowing you to interact with your PowerPoint, Keynote, Word, Excel, Outlook, Quicken, IE, Firefox, Safari, World of Warcraft, and other PC / MAC applications.

Access your PC or MAC programs, games, multimedia content, and files over Wi-Fi and 3G/4G networks. Go everywhere with just your iPad without having to carry your computer!