Ask questions or just talk about different languages. Since BrainKing is an international game site supporting many languages, this board can be kind of useful.
Pedro Martínez: Good point. I have used it with languages that I have a little bit of a knowledge of. (Spanish, French), and those are probably the times when it has been good enough to get a general idea.
Czech seems like it would be a pretty difficult language to learn. (From an English perspective anyways). I could be totally off on that of course, but it's the impression I have.