Today, Google released its Android Device Manager. Now, you can locate and ring your phone or tablet remotely.
If you've misplaced your device in the house, you can use this service from the web to ring your phone. This function will override any silent or vibrate settings, so you won't have to worry about not hearing it. Additionally, it will show you exactly where on a map that your device is hiding. You can also elect to enable remote wipes, though this needs to be set up on your phone or tablet first before you can trigger it remotely.