I'm having issues with the Add to Cart function as well, click and it does nothing (before it was sold out, obviously). I've noticed that none of the tabs (specs, sales stats, etc) work either.
First found out when I tried to purchase a Brigadier of Carolling at midnight. You owe me, Woot!
Win 7 Ultimate 64 bit
Running ad block but set an exclusion for the entire woot.com domain, still no luck. Cleared cache as well.
Just tried it on my laptop (Win 7 Pro, Chrome) and it doesn't work. The site looks terrible on IE 8, the entire site formatting is borked, I don't even see an Add to Cart option on any of the Woot sites.
Get your site fixed!
Installed Firefox and that doesn't work either!