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API-Guide has over 900 functions, all documented, and explained with an example. Several functions also have a dotNET equivalent and dotNET example code.
This tool has saved me hours of google searching and message-board posting trying to find a certain API function that is crucial to perform a certain task (plus I don't have to connect to the internet if I want to find something). For each function it tells what the function does as well as descriptions of each parameter the function takes. There are examples in Visual Basic too.