To get started with coding, you will need the Windows API Code Pack at http://code.msdn.microsoft.com/WindowsAPICodePack for the Sensor APIs. Now that .NET 4.0 has shipped, you can get most of the multitouch functionality by downloading the multitouch drivers (specific to your machine) and WPF 4.0. There are also a lot of great resources in the Windows 7 SDK.
This show was recorded on St. Patrick’s Day, which is why we are both wearing green and being a little goofy. :) You can view the show at http://technologyandfriends.com/archive/2010/04/12/tf081.aspx, or below.