Is there open source plugin for internet explorer?

[stanza]

I want to code a plugin for internet explorer. What I mean is something like a google toolbar at toolbar.google.com which runs as part of the IE toolbar.

I can find code examples for plugins for firefox but it seems difficult to get an example for internet explorer. Can somebody point me to an easy one that I can take a look how to write it?

[bcolflesh]

[codeproject.com...]