It looks like Trolltech is integrating Webkit into QT in a deep way. It’s available as a heavily updated widget, and they’re working to coerce their JavaScript core with Webkit’s. It’s not available in the official builds yet, it looks like they’re serious about the concept.

Check out the source (git repository) and docs (webkit/qt wiki pages).

Here’s a rich QT-based code formatter.

An article from TrollTech describing their API design approaches, Designing Qt-Style C++ APIs.