The FAA posts preliminary accident data for the past 10 days at this URL
http://www.faa.gov/data_statistics/accident_incident/preliminary_data/
After 10 days then you'll need to look at the NTSB's website.
IDENTIFICATION
Regis#: N4063W Make/Model: PA32 Description: PA-32 Cherokee Six, Six, Saratoga, Turbo
Date: 06/29/2008 Time: 2150
Event Type: Accident Highest Injury: Fatal Mid Air: N Missing: N
Damage: Destroyed
LOCATION
City: NORTH LAS VEGAS State: NV Country: US
DESCRIPTION
AIRCRAFT CRASHED AT THE 7000 FT LEVEL OF MOUNT CHARLESTON, THE FOUR
PERSONS ON BOARD WERE FATALLY INJURED, 22 MILES FROM NORTH LAS VEGAS, NV