Barry Welford at Cre8asite Forums stumbled upon a post by Rich Tehrani where Gmail has a feature that translates words on the fly for you, which is especially helpful if you're reading an email within Gmail and need to look up the words quickly.
What you are doing is chatting to the bot that does Google translations. So for example if you want to translate from English to French, you add firstname.lastname@example.org as one of your contacts. Then whenever you go chat with en2fr, what ever you say will be translated in the reply from the bot. If you're a frequent user of Gmail, as I am, you may find this a very useful feature. The translation isn't perfect but it often will provide what you're looking for.
As eKstreme echoes, however, the translation really isn't perfect. It will do a basic translation and you'll get the idea of what is being said, but you won't get the best translation. Still, it's a cool tool to use if you're in need of a quick definition.
Forum discussion continues at Cre8asite Forums.