http://bug.gd
The idea is simple: you search for an error message on bug.gd. If the solution is there, you win. If not, then we'll ask you (48 hours later) how you figured it out. Your answer is saved to help the next lost soul.
Our latest news is our launch of a Firefox extension that lets you skip the email reminder aspect, saves some keystrokes (auto-paste), and tracks your unsolved errors.
The vision is to get to the point where silly things like computer errors and crashes never need to be solved twice. If someone solves a problem, everyone gets benefit of the answer. We've been asked why users would use the service over searching Google, but we see that as saying you prefer throwing things in the trash over recycling. Some people are like that, but there are many of us that don't want our work to be wasted. As a bonus, since all the solutions submitted are indexed by major search engines, you're helping even those who don't use the site.
Back in October we prepopulated the database with 65,000 Microsoft KB article error messages and it's been growing ever since. Let us know what you think, if you have a moment.
(And, yeah, the logo is intentionally and subtly buggy. We'll get over our silliness eventually.)
You should also have categories (even if they are derived by keywords in the content), which you should display on your solved solutions page. This will reduce the number of "clicks" a search engine spider has to do to get to the full solution pages.
Bonus, have lateral linking to categories and other problems. So if I'm on a bug for rails, you should have a "view all bugs about rails" link that goes to a list view as well a few links to common rails bugs.