Lango LAB appears to be a well designed language-learning site that, to a large extent, is user-generated. Unfortunately, it primarily uses YouTube videos, which means it’s not a viable tool for most public school teachers and students in the U.S. since the vast majority of school content filters block that site.

However, others without that obstacle might find it useful. If you fit into that category, I’d encourage you to read Nick Peachey’s post describing it more in-depth.