lingro is a free multilingual AJAX dictionary and language learning site. Currently supporting English (ESL), Spanish, Italian, French, and German.
Don Doehla's insight:
Interesting new tool - might help students with bi-literacy skills. I like that the reader can add definitions to the resource, as one can write for a wikipedia article (that is the intent, or course!). I wonder about the complete reliablility and hope/trust that all contributors will add definitions and explanations of idomatic expressions which are accurate! We will need to teach our students to use this tool wisely, if at all, and to think critically about whether the information which pops up is indeed accurate. There is a lot of potential here! I would like to see Lingro add in the option to use the tool in one language - for example, French to French - as a target language resourse and not as a translation or cross-linguisitc skill. Nevertheless, this is a tool worth trying.