The Guardian has a dataset and a map produced via Fusion Tables (do you think a name that suggests mapping would be better for the general public?).
Here's the Telegraph's.
And a tweet map based on the #LondonRiots hashtag built on the well-known UKsnow code.
I do not see one yet from Esri (current events maps).
The Atlantic has a map of boroughs that hosted riots (is that the right verb? I think not.) and those with more than the average number of surveillance cameras.