That's another possibility of course, that you might wish to look into Ender. GTK-HTML doesn't get the same amount of press that KHTML does, but it's written in C and is actually a fairly capable embedded html renderer. It relies upon GTK/GDK which already has a port to Windows, the GNOME help system uses it for rendering afaik so it should be easier to integrate with Wine. Finally it supports editing, which might come in useful in future.
GTK-HTML is far too basic for our needs. We need at least DHTML and JS support for any IWebBrowser/IE replacement to be useful.
- Ender