The Scarred Lands books had some fantastic pics. B&W, as fitting with a WW product (or close enough), but some very good shots.
To be honest, I disliked much of the 3e era art. It hasn't been until the last two maybe two and a half years that I've really started seeing stuff that I've liked. Tome of Magic being a personal favourite. Dragon's art has REALLY ratchetted up in the last few years as well. Artists like Andrew Hou and Eva Wilderman (sp?) have done some bloody fantastic stuff.
One thing I haven't liked is the Eberron art. Or at least the examples that I've seen, particularly in the pages of Dragon. The cartoony art just does nothing for me. Then again, I don't like Lucaks or Kyle Hunter either. Take it as it comes.