Hi all:
Just jumped in rather late. I was down at the Joshua Tree on May 19, 2007. The area is looking good (fans keep it clean and undisturbed). I was at Zabriski Point as well. Death Valley Junction is where many photos were also taken of course. Bodie is at the start of their desert journey. The end of the journey is at 29 Palms, where the Harmony Motel is located. The JT tour book has the photos of course. I have found most of the sites where the photos were taken. The "two telephone poles", these shots of the band can be found on HWY 190, mile marker 130. north side of the road. Not too far from Death Valley Junction. In Shoshone, south of Death Valley Junction, you can eat the Crowbar Cafe, where Bono once ate.
I have a few more desert trip sites to find, but most of them I have found now; I have GPS coordinates of those found as well. It worries me giving out the info out though; I hope no one damages the sites.
Just for fun, over the past couple of years I have been tracking U2's original desert trip, and I have the route down. It's Hwy 395 from Bodie, south to hwy 190, beginning to end at Death Valley Junction. South from there on 127 down to I15 onto Kelbeker Rd. cross I40 and continue on Kelbeker Rd. Turn west on Old National Hwy (Route 66), for a couple of miles, then south again on Amboy to 29 Palms.
There is their Desert Trip. It's fantastic and it helped make the Joshua Tree. You'll feel the songs as you drive it.