Paul sez, "Lingro lets you enter any webpage and make every word clickable for a
Boing for example). There's a bookmarklet for
handy access, and a simple search-as-you-type dictionary
that is faster than any multilingual web dictionary out there.
"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
"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)."
The use-case here is people who are pretty good at reading another language, but get stuck on the occasional word (I'm this way with Spanish), but more importantly, the project builds on and releases free and open multi-lingual dictionaries, which are long overdue.