Boing Boing has a post on Lingro, which is a new tool that makes any word on a webpage clickable and translatable. It can also help you learn a langauge!
Find out more about Lingro.
“It works with English, French, Spanish, Italian, German, and Polish (with more on the way) and if you find a missing word, you can add a definition.
“Our goal is to make the coolest language learning tools, build community, and build open content dictionaries that anyone (even our competitors) can use in their projects (licensed under the FDL and Creative Commons licenses).”