The other day police.uk launched new crime maps. One of the nice features about it is the data has been concatenated to centroid of the streets. This generalized point data helps protect the victims while still giving the map reader a general understanding of the distribution of crimes.
Another interesting component of the site is how large of an area it covers. There are many cities and even counties which have interactive crime maps, however this is spanning a large area and multiple jurisdictions.
Here are some interactive crime maps within the San Francisco Bay Area you can go to the Omega Groups CrimeMapping site.