I agree that tagging would add to relevance to Reddit’s searchability and categorization (although reddit’s subreddit option is akin to adding a tag).

I did another study of reddit data which crudely chopped up all the sumbission headlines and divided up every word (plus two and three-word combinations) into a tag. Data here:

http://spreadsheets.google.com/pub?key=r_mYxAWnRAJyyluLBM2GZDA&output=html

That data set was taken roughly over the course of this March to the end of May (the keywords get more interesting a few pages down after the common english words and subreddit categories). My goal for this project was to try and spot trends / memes by the rise and fall of certain keywords or combination of keyword frequency, but alas, I’m overwhelmed by the data at present and haven’t sat down and crunched the numbers…

Interesting stuff. Lemme know if you wanna collaborate on a project!