I believe we did as described in http://www.devx.com/codemag/Article/22404/1763/page/2 by, if memory serves me right, Claudio Lassale along with articles by Rick Strahl, but I don't get intellisense.

Well, strictly speaking, I guess I do - but not quite what I expected.

I also run:
%systemroot%\Microsoft.NET\Framework\v1.1.4322\regasm.exe comtest.dll /tlb:.\Com.comtest.tlb
%systemroot%\Microsoft.NET\Framework\v1.1.4322\gacutil /if comtest.dll

Regardless, the intellisense popup always only displays Equals, GetHashCode, GetType and ToString, which appear to be some sort of default.

TIA

Peter