Do you have any names in mind? I've been looking around for a solution, I checked rubygems and github but didn't come up with anything.
Programmatically, how would you implement location based search, given only a zip code or street address? I'd imagine I'd have to tie in to a service like google maps. I skimmed through the API but so far haven't found anything helpful since the search has to be performed on my database, rather than Google's index.
Any more ideas would be great, thanks.