On the all sites page, there's statistics on questions asked, answered, etc. I'd like to see a number (or percentage) of questions closed for each site.
Update - I don't know the best place to put this information, maybe SO doesn't want it on the main page :) But how about on each meta-site? Although I think having the information in one place would be best for comparisons, I'd settle for having it anywhere. :)
Why? One of the issues that has come up, on several new sites, is how tough the moderators should be (moderators including both official and people with high karma). Should they be really laid-back, and wait for a question to get lots of downvotes to close? Or be more aggressive on closing possibly-poor questions?
Being able to see what other successful sites (successful = original sites, maybe some of the new ones) might be useful, indicating to a new-site moderator whether their site was over- or under-moderating.
Granted, different sites might have different levels of correct-number-of questions-closed. Sites like Programmers, allowing more subjective question than SO, would be unlikely to have the exact same number of closed-questions.
Still, it would at least be an indicator, if one site was significantly out-of-line with other, similar sites.