Re: BuddyPress Geo plugin
I had a need to do this with posts (geocode, sort by distance, map). I did it with two WP plugins Google Maps Geocoder and SimpleMap. I had to rewrite Simplemap to query the post/postmeta table instead of its own tables.
I will need to do the same thing for users and groups once BP 1.2 is out. If no one tackles it before I do, I’ll donate the code, but it won’t be plugin worthy as I don’t do admin interfaces and options pages. Since the site is for me, I save my time and bandwith by putting settings in a well commented php file.