Wizards of the Coast have just recently published the 4e Monster Manual II. I was fortunate enough to be commissioned to work on a number of pictures for the book.
In particular I enjoyed working on the Remorhaz (ice centipede/thing) which features as a chapter start, and thus runs across two pages; though this presented it's own problems with the guttering falling across the image, about a third of the way in from the left.
I was also gratified to see that the Frost giants have been used as part of the banner logo for the D&D web site, and also featured in Jon Schindehette's (lead D&D art director) blog http://artorder.blogspot.com/2009/05/devolved-gnomes-concept-tuesday.html
All images ©Wizards of the Coast