Matt Cutts points out a great mashup for apartment hunters: Walk Score. One of the most important criteria I have when looking for a place to live is whether I can walk to (or stumble back from) places. Walk Score provides an easy way to answer that question. You specify an address and it calculates a walkability score. The score takes into account things like the proximity of grocery stores, restaurants and bars.
More than that, it also auto-generates a great little neighborhood guide. Most local search tools require you to search for a business name or category. Walk Score makes it easy to get a feel for a neighborhood by showing the nearest bars, restaurants, grocery stores, movie theaters, libraries and schools.
Here’s a Walk Score map of my neighborhood:
Walk Score doesnt’ take into account hills, so those looking for housing in San Francisco may want to consult a topographic map.