The Citrix Receiver software works with unmodified Windows 7 applications. The company mentioned in their blog that the iPad will be perfectly suitable to support a Windows 7 virtually:
“It turns out the 9.7 inch display on the iPad with a 1024×768 screen resolution works great for a full VDI XenDesktop. Windows applications run unmodified and securely in the data center, and even multiple applications at once.“
Vice President Chris Fleck said, “If your company has XenDesktop or XenApp you will be happy to know you will be able to use your iPad for real work as well.” The virtualization software already works great on the iPad SDK kit, and the company promises the application will be ready when the iPad launches.