Google Goggles is a photo-based search tool that is accessible from any Android device. After installing the tool, snap a photo (Google heeds that right now it works best with pictures of books, DVDs, landmarks, logos, business cards, artwork and bar codes) and wait as Goggles scans the image, analyzes it and identifies it. You'll receive information based on the image, such as details about a landmark or price comparisons for a certain book. Bar code matches will provide a link to Google Product Search to allow you to compare prices.
5 Things You Didn't Know You Could Do With Google Apps
Google Apps FAQ