Just in case anyone needs this (I just needed it, and found it on someone else's blog, so I'm just spreadin' the love...), Amazon.com's customer service number: (800) 201-7575

Also, I learned something interesting: Amazon does not ship on the weekends, so if you order something Thursday night/Friday morning, it won't actually ship until Monday or so. Saturday and Sunday appear to be black holes as far as the "usually ships in 24 hours" timeline goes. Got this straight from the customer service guy who explained it as an error on their web page which crops up when you select Standard Shipping (the site said my order would ship this Saturday).