Lingro

Ever try to think of a word in another language, and you just can't come up with the right translation? Lingro is just what you need. Register for free, then enter any url into the field in step 1. Next, select your language (for example, English to Spanish). Once Lingro has opened the website, you can select any word on the page and Lingro will give you a translation. Lingro does not translate the website itself, just whatever words you select once you've entered the url.

Pretty slick.