The great thing is, they keep improving their service! Last Spring they started ranking cities by how bike-friendly they are, and now they've already made that data more granular. You can now see bikeability info on an address-by-address basis for 25 cities in the U.S. and 11 in Canada.
So you can now type an address and get the bike score for that particular location, but you can also look at those cities' maps (full list here) and see overlaid 'heat maps' that show which areas are better than others, either for overall bike score or for things like bike lanes or topography. It's very cool!
They've also incorporated bike-sharing data:
Bonus: Walk Score Now Has Bike SharesKeep up the good work, Walkscore!
We have also mapped nearly 1,600 locations of bike shares across North America. Search for any address in these cities and find bike share locations listed as one of the main categories: Boston, Denver, Minneapolis, New York, Houston, Washington, D.C., Toronto, Montreal, Ottawa, Broward, Charlotte, Des Moines, Kailua, Kansas City, Madison, Nashville, Omaha, San Antonio and Spartanburg.