I'm definitely Not being sarcastic, I know that your New Feature queue is Quite Long.
I just noticed that the L.A. Times Guide has added a Google Maps enhanced feature I (we?) asked for last year - showing a map of places near an existing address.
An example called 'Whats Nearby' is at this page: http://theguide.latimes.com/restauran...
I'd settle for this basic approach first, add screening subsets later.
Having a linkable "Whats Nearby" feature (MetaPlace?) in CH is my #1 Killer App to borrow a phrase.
Fortunately the LA Times Guide venue database is pathetic compared to CH, not likely to steal away eyeballs.
Edit - added MetaPlace lost during editing.