Your One Stop Shop For Win32 Call Wrappers
If you haven't visited pinvoke.net yet, what are you waiting for?
I added my contribution today: complete sample code for dealing with GetGlyphOutline data. I had to deal with this stuff all day to get true type font support working with SWFSource.NET. It wasn't too easy since there isn't any working sample code out there for this...however, if it was easy, it wouldn't be so much fun, would it?