http://developers.de/blogs/damir_dobric/archive/2009/07/26/multi-touch-for-silverlight-3-and-windows-7.aspxFor all friends of multi-touch capabilities Silverlight 3 has a build in support for multi-touch. However, to support it, your app has to be running on Windows 7. For this reason it will be quite difficult provide interoperable SL-applications for differentenCommunityServer 2008 SP1 (Build: 30619.63)