Callum Prentice (
ubrowser) told me that his embedded web browser works together with Irrlicht. Yep, that's that thing known from
Second Life. It also looks very nice in
Irrlicht:

At it's heart, it uses the Mozilla Gecko rendering engine that is used in Firefox 2. The Irrlicht integration still needs a bit of work, like input. Get the
source here and the
binary with some demos here. Would be cool if someone is interested in improving and developing this further.