Here's a google map with the homicides from January, February, and March. By my count from the newspapers and coroner's websites, big, bad Pomona saw 5 homicides, Claremont (1), Montclair (2), Chino (1), Ontario (2), Rancho Cucamonga (3), and Upland (1). Of the 15 in Pomona Valley, 3 were officer-involved shootings.
In Pomona, I believe arrests have been made in 4 of the 5 homicides. Congrats to the Pomona PD.
For the first 3 months of 2009, I don't see a discernable difference between Pomona Valley and the adjacent San Gabriel and San Bernardino areas, but I'm open to opposing views. For a westside view, take a look at the Los Angeles Times Homicide map.