You've got the basis for a "you-like-this-so-perhaps-you-will-want-to-read-this" recommendation engine. Perform some - mentioned in another reply - n-gram analysis on the corpus; do some basic cosine-similarity analysis with the feeds people subscribe to and see what pops up. Try other techniques (from e.g. ICWSM[1]) (last time I did something like this is April 2007); iterate; analyse results; publish.
At least you'll have fun (YMMV)...