I actually just started working on something like this the other night.
Right now it's just showing the last 10 accidents mapped, the last 10 accidents that caused a death and the last 10 that caused an injury, plus some simple totals.
Somethings aren't fully working like you can click on a map marker and see a stand in popup but you cant yet click on the accident list and see a popup though I hope to get that working this weekend.
There's lots more I want to do with it though, like filtering by by areas (precincts, zips, districts), more aggregate data (how many cyclist deaths, how many unspecified factors, most dangerous intersection, most deadly day of the year etc etc)
It's coded right now to refresh it's data from the socrata portal when that updates automatically and down the line id like to get it to notify based on some kind of basic rules like "new accident where someone died" or "new accident where a cyclist was injured."
Give it a quick look and let me know the kind of stuff you might want to see in a tool like this and ill try to get the stuff people are asking for done as a priority.