Great idea. A couple feedback items:

- The icons on user pages which stand for areas of expertise aren't really helpful since you have to hover over them to see what most of them mean (example: a coffee cup means General Advice and a person icon means Usability). At the least, these should have titles above/below them.

- I'd like the hardcoded areas of expertise removed in favor of an autocomplete freeform box, much like Stack Overflow's tags box. For example, I'd like to put that I'm a Drupal expert and I'd like to look for node.js help, but neither of those are options.