Adding maps to site elements is way-fun and can really boost the information content of a feature.  We've just added a rudimentary map to the restaurant database on 77square .com.  What kinds of features would make maps really pop for you?

Driving directions?  A larger version?  Printable version?  Street view?
Next up, advanced search features.  Right now, the 'Features' part of a restaurant listing is click-able, but doesn't do anything (lazy links!).  We'll be making these link to more search results and combine all the search-able parameters into one super search, available as a link from the main search.