Amazon TextBuyIt is a service that lets you find, compare, and buy products using SMS text message from your phone. Just dial the shortcode AMAZON (262966) on your cell and include in your message appropriate keywords for your search, or get more specific by sending the UPC or ISBN for the items you're interested in. They will send you back information about matches, two at a time. You can choose to buy one of your hits, or ask for more information on an item, or even to view more results.
Once you've decided on what you want, you send them a message back to place the order. They will phone you back to confirm your order, and verify payment and shipping information. Then it's all over but the waiting for the delivery guy.
Amazon TextBuyIt is a free service; your carrier's charges for text messages will apply.