How to get started with developing Internet Explorer extensions?

Question

Does anyone here have experience with/in developing IE extensions that can share their knowledge? This would include code samples, or links to good ones, or documentation on

Answer 1

I agree with Robert Harvey, C# 4.0 features improved COM interop. Here's a bit of older C# code, in desperate need of a re-write.

http://www.codeproject.com/KB/cs/Attach_BHO_with_C_.aspx

This is an attempt to simplify things by avoiding ATL and going with Spartan COM:

C++ and COM to get BHOs going