How is the tagging system implemented here at S[O|F|U]?
I am currently building a website in which users can tag a submission, similar to that of SO, Flickr etc.
I'm just wondering how SO manages all the tags on here - what does the taxonomy look like?
More generally - I am struggling to decide to normalize the data or not. What is the best practice here?
Edit: I have seen this entry on tagging, but still am unsure which approach is best overall.