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After a quick test of the site, I like it, and I like that you're trying to make it freely accessible. I'm definitely starting with English: it's a decent first-language typing tutor too.
For my second language, I hope you'll have German ready, but my kids will probably need English and Spanish typing skills for school. (So there's my prioritization hopes!)
I don't know if I'll ever use the site -- gotta finish learning italian and then move on to german and then maybe relearn french, but I think you've got a great site and I hope it does well. Thanks for using your creative and technical energies towards something that will help others empower themselves.