There is a way to see unsolved bugs, you can search by tag "bug" and exclude tag "fixed", and for display select "hide ignored". Those would be nearly all.
If a bug gives error 500 and 404 then I fix it the same day, right now I don't know of any such issues.
We have bugs database too - http://bugs.askbot.org, will be using it a lot more actively soon as askbot will be my full time project starting mid-July and at least one more person will be hired. I'll post an update, there will be quite an interesting development :). You are welcome to register at the bug tracker.
Askbot has many test cases, run on every commit to the github, that's why it is more stable.