I went to Weymouth this morning and picked up way too much stuff, despite it sounding like the piles are much smaller than a fortnight ago.
Here's the amended list of what I saw vs. DwarvenDog's first report:
Monster Manual 2 only, save for a sole leather bound MM I, below
Draconomicon, Lords of Madness
Frostburn, Sandstorm, Stormwrack
Very few 'Complete' books left; Warrior, Divine, Mage, Psionic
all 3 leather-bound Core books (for $30 each, normally $75)
all race books (stone, wild, legacy, dragon, eberron)
Magic of Incarnum, Weapons of Legacy, Tome of Magic
Many, Many FR and Eberron Setting Books.
Heroes of Horror
Planar Handbook
Red Hand of Doom
3E softbound splatbooks
Also a few copies of the d20 Modern; Core and Threat hardbounds, and the Future Tech sofbound.
Quite a few Eberron modules, and a number of GM screens that I couldn't tell were either 3 or 3.5.
Happy hunting!