如何开始使用Windows 7小工具

I have never programmed a gadget for Vista or Seven, but I would like to try to make one. But where do I start? I have tried to search around on google and msdn, but I haven't managed to find anything useful. Either very, very old stuff (Vista beta stuff), already made gadgets or differences between gadgets in Vista and Seven. But that doesn't help me, since I don't have a clue how to make a gadget in the first place... I haven't even managed to find out what they are written in...I have never programmed a gadget for Vista or S