Google Goggles lets you use pictures taken with your mobile phone to search the web. It's ideal for things that aren't easy to describe in words. There's no need to type or speak your query - all you have to do is open the app, snap a picture, and wait for your search results.
Google Goggles works better with certain types of queries. Try taking pictures of books & DVDs, landmarks, logos, contact info, artwork, businesses, products, barcodes, or text. Currently, it's not so good when taking pictures of animals, plants, cars, furniture, or apparel.
For the best results when taking pictures, hold your phone in "left landscape" mode, as shown below, and press the on-screen shutter button with your right thumb. But Google Goggles is currently available for Android devices running Android 1.6 and above. To see which version of Android you're running, go to Settings > About phone > Firmware version.