About an year or so ago, Google introduced Android Voice actions, which allowed users to control actions using their voice. You could call someone, send text messages, browse the web and do other common task using your voice.
Initially available in the U.S., Google now added British English, French, Italian, German and Spanish for the five respective countries. You can make Google searches using your voice or say the following commands: send text to, call, go to , navigate to, directions to, map of, etc. If you are running Android 2.2 Froyo or above, download the Voice Search application from the Android Market and speak to your phone.
Source: Google Mobile Blog, Android Market