I really like the custom language tutorial and I understand most of it, but I'm having trouble with the bnf and flex lexer concepts. I would love to see a basic flex and bnf grammar kit tutorial with a c style language. Just real simple with keyword support and matching braces and perhaps strings. I think this would really tie the concepts together for me if I had something that could go step by step through the thought process of writing these files. The properties file example is nice, but it would be great to have something that is presented with a c-style language since there are so many of them.