Blizzard now offers a way to download your game on-line. If you have a legal cd-key and a non-working disk (scratches, lost, stolen, etc.) you can connect to www.blizzard.com/store/ to retrieve the game. Just register at their store, enter your cd-key, and start downloading!
That dude, Tom Boyd, is really upset about the backlash from his "it's your fault you're freezing" thing because he claims he resigned before saying it, so it wasn't like he said it in his official capacity or anything.