to texas? pft ez.

jk.
Make sure you take breaks too! they keep you awake and aware, not to mention get the blood flowing to the legs. I was reading an article a while ago of some guy actually DYING on an airplane (overseas- 12 hours) because there was virtually no circulation to his legs (long periods of in-activity)
What everybody else said.... spare car fluids, basic tools like screwdrivers, DUCT TAPE (omg the things duct tape saves me from), water, food, list of contact numbers, etc. Don't forget the cellphone re-charger!
and to quote Vr4, could you imagine someone bugging you for 1500 miles? all you need are some new songs for the CD playa
Oh wait, you're leaving cali? :( oh poo. Atleast smog laws dont apply to you now :P.. Hey can i register my car under your state? hehe. budday -_-