Microsoft has released their previously OEM only Touch Pack for multi-touch monitors to anyone that wants to download it and use it. You must have a multitouch display to use it, however.
The Microsoft Touch Pack for Windows 7 was first introduced last May as a series of 6 applications that are designed to showcase Windows Touch in Windows 7 and to help people learn touch gestures. It consists of 3 casual games, and 3 Microsoft Surface applications that have been created for Windows 7.