For those of you who may have missed a Catch of the Day or who didn't have the opportunity to look at some of them during this past week, here's a second chance.
italki is an online tool for foreign language learning, linking people from everywhere in the world in a community to learn from each other.
Duolingo, currently in private beta, allows you learn a language for free while simultaneously helping to translate the web.
Livemocha blends traditional learning methods with online practice and interaction with native language speakers from around the world. The aim of Livemocha is to create "a world in which every human being is fluent in multiple languages."
Three websites that each offer substantial compilations of language learning resources.: Word2Word, Learn a Language, and Open Culture.