Sites devoted to knowledge exchange are common in information technology.  One particularly good one is stackoverflow.com.  This particular site is exceptional for the following reasons:

1. Anybody can ask a question or answer a question.
2. Logged in users of the site can build a reputation by asking good questions or giving good answers
3. Users with high reputations can do more on the site
4. Any user (with moderate reputation) can rate an existing question or answer
5. Any user (with moderate reputation) can edit an existing question or answer to make either better
6. Best rated answers get pushed to the top

We could try to do something similar on this blog.  I know I have a bunch of questions I need to find answers too.  Some of these questions require a bit of expertise to find answers to, but others probably can be answered with a few google searches.