I have a recently renewed interest in this thread as I have begun to (re)learn the Czech language.
More info for those interested.
As some of you know, I was a linguist with the US Army over 15 years ago. I was taught Czech and Slovak at DLI (http://www.dliflc.edu/). I have recently begun dating a beautiful woman (http://www.mediafire.com/imageview.php?quickkey=impmexwg2se&thumb=4) who currently lives in Alaska as a US citizen, but was born, and grew up, in Bohemia (http://en.wikipedia.org/wiki/Bohemia). We intend to spend the Christmas - New Year holiday visiting her family and friend back home in the Czech Republic.
I have discovered a free language flashcard system that is very good. I highly recommend it to anybody who is looking to use flashcards to (re)learn a language.
Before You Know It (http://www.byki.com/byki_descr.html)
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The Lite version is free and all you need if you just want traditional flashcard functionality.