Guess what language
I doubt someone would find this too useful but I smiled today when I found about the guess YubNub command. You feed it text, it gulps the language it’s in. A great way to showcase YubNub‘s open-ended fun, courtesy of Xerox research. It would have been a godsend when I was dealing with "Imagery’s multilingual rush":http://elzr.com/articles/2006/06/10/imagery-debutante (Oh, how GMail angered me then! Smart enough to correctly spellcheck anything I gave her, yet coyly keeping the language name to herself!). Hope I need it again soon.
And since we already seem to be on a language landslide, some months ago I found out playing with Google Translate that when you translate a website from Chinese to English (which is currently beta), you can hover on a sentence to get the original Chinese fragment in a quick popup. Mighty cool. All the more impressive a feature coming from a website. (Now let’s only hope they plan to add it to the other language pairs too…)
Final language tidbit: translate “Hello, how are you?” to Spanish with Google. Your immediate response is “¿Hola, cómo eres?,” sucking the life out of even the hardiest machine-translation enthusiast.