He’s got two great ones for ArchiCAD users.
There’s the Artlantis Attitude which obviously covers rendering with Artlantis. And for people looking to do all their rendering within ArchiCAD (yes it’s possible), he also has The LightWorks in ArchiCAD Book. From everyone I’ve talked to, both books are the bible for rendering in their respective application. Semi-related, you can find Dwight commenting on all sorts of posts on the ArchiCAD-Talk Forum. If you’ve got direct questions about either book, feel free to e-mail Dwight here: firstname.lastname@example.org