My husband has been playing with some information from WFG (and thinking about how to make participation more useful), and has put up a tool for comparing users' recommendations. Go to http://sdy.org/wfg/recs.cgi and enter your user-id (the last part of the URL for your shelves).
The results show the amount of overlap in recommended listings you have with other users. Following the "details" links shows which listings you agree and disagree on. The listings that others have recommended that you haven't might show something you'd like.
Trying this for me (s-d-youngren), shows that I have one recommendation in common with each of five other users: shutsumon, meilin-miranda, m-e-traylor, ejames, and dash. Checking the details shows that it's the same recommendation for all of them (The Aphorisms of Kherishdar), and I notice that two listings come up in their recommendations more than once: The Astonishing Adventures of Lord Likely and Ember. So I might find those especially worth checking.
Mark is still looking at what might be useful, so if you try this out, we'd be very curious to know what you think about it.
One important note: The data are not real time. If you make any new recommendations, they won't show up unless Mark downloads and processes the listings again.