Say you're in a neighborhood you really like, and the end of your lease is coming up. Fire up PadMapper, and you can see the rental listings all around you!
PadMapper shows you a list of nearby apartment and house rental listings, ordered by distance from your current location, and makes it trivially easy to get in touch with the landlords/brokers to schedule viewings. Also, save for later as a favorite.
PadMapper supports Boston, New York, Washington DC, San Francisco, Los Angeles, Vancouver, Ottawa, and about 65 more. For a full list, check out the support page.
And when you're at your computer, check out the free online version (with much more mapping) at PadMapper.com.