Google finally adjusted their Goggles service for the desktop, so we can now also add their service to list of reverse image search tools, which already included the algorithms of TinEye, Cydral and GazoPa among others. First results show it's a winner, returning more identical results, more visually similar images, and interesting context information. Go to images.google.com to see if it's available in your region.
RevEye, the Chrome plugin to perform reverse image searches. It now includes searches by Google, TinEye, Cydral, and I've added Yandex and Baidu to the list since they also do pretty well.
RevEye v1.3 is a free download available from the chrome web store.