I think instead of this, you would be better off writting/using a custom search engine.
Google offers some options.
Where for example you could just search for content in the first post of certain sites X,Y,Z,....
Creating a massive repository would be a lot of work and upkeep unless you wrote a script and could convince people to run it. (CRON task or something similar)
The next problem, believe it or not problems with the same symptoms are often not the same. Just ask John how many BSODs share the same stop codes...
