I've been working on fifohead.com for past 2 months on the side. It's a digg-style site for technical interview questions. I use the Q&A format similar to StackOverflow and add the quizzes to help users practice solving problems.
Here's an example of a quiz: http://fifohead.com/quizzes/1-Essential-guide-for-Verilog-developers<p>I'm also in the process of cleaning up the code to make it easier to understand and more reusable. If there's interest, I can spend some extra time extracting the most sensible features to release some kind of open source FifoExchange platform.
I'm more embarrassed that my coding style coming from a hardware background may be a horror for anyone to use or understand.