In my limited experience with Stack Overflow, I have found it immensely helpful, the reward scheme for people to ask good questions and in turn answer said questions is the backbone to the success of the site. There is however one area I think the site lets itself down. Recently I wanted to find out a good RSS generating module for Python. I searched the web, and I searched Stack Overflow; the top web results were indeed Stack Overflow questions.
However on closer inspection the questions were as much as 5 years old! So I re-posed the question.
The question was closed as off-topic. I think Stack Overflow is doing a disservice to anyone trying to find something out by search engine or Stack Overflow by allowing old posts to remain so prominent and not permitting new questions to re-assess the situation.
I think Stack Overflow should think of putting some sort of time decay on the number of up votes these posts have, as anyone browsing Stack Overflow or the web will stumble across potentially outdated information before they discover a more current and relevant source of information.