EDIT, 3/7/10: Looks like it's all over but the shouting by fanboys, folks, as the prices and life returns to normal. I'll leave the links up a little while longer and then take them down later, so if you're still buying, check your prices in your shopping basket. Hope you got some good deals. Remember that it's entirely possible Amazon may cancel your order and refund your money (this unexpected situation would have left them without enough or any stock to fill these massive orders). And as Gail Simone so wisely tweeted: "Everyone who does buy something from this sale should make a point to go buy something cool at their local comic shop, as well."
EDIT #2, 3/7/10: Looks like everything has reverted or is changing back to normal, folks, so I've removed the links. You can try surfing around to see if anything is still marked down, but at this point it's likely you may get a nice "Sorry, we can't fill your order, here's your credit back" email from Amazon.
EDIT #3, 3/8/10: Part of my order has shipped, and the rest still shows as "Shipping Soon" or "Not Yet Shipped."
EDIT #4, 3/9/10: The rest of my order has been cancelled. Ah well, life. You pays for your ticket and you takes your chances.