What exactly are you looking for? TAPI, being a W32 API, is really geared towards C(++). You might find a .NET wrapper on gotdotnet.com but I have no idea how well that works (not that I wouldn't like a .NET TAPI.. pure W32 API makes me cringe).
If you install the Cisco TAPI TSP (available from the applications page on your call manager), get the TAPI developer documentation and the TAPI samples from the developer support pages (http://www.cisco.com/cgi-bin/dev_support/access_level/product_support) I think you should have no problem getting started. The sample apps were written in VS6 (the C++ component of it to be exact).
