Nevada DOT Road Construction Map: http://safetravelusa.com/nv/
Nevada Road Constrution Report: http://www.nevadadot.com/traveler/co...asp?district=1 (says Primm closure only through 2/11/09 so it may not be an issue around Coachella time)
CHP Incident Log: http://cad.chp.ca.gov/ (you'll want to look at Barstow when you're going across the Mojave and San Bernardino & LA when you're getting out of LA til you get North in I-15 to Victorville.