Didn't read all the pages but want to comment on the cool down mode. The droid x has it and it hasn't been a problem for me except for 1 time. I left my phone in the car dock in the blazing hot sun and it went into cool down mode. I took the battery out and let it cool down and when I put the battery back in all was back to normal, except for I couldn't make any phone calls. The dialer would just close. That kind of freaked me out. Came up with the idea to make it over heat again and go back into cool down mode and let it sit and cool down without turning it off. That fixed the problem. When it comes out of cool down mode it says something like cool down mode has exited.
I must say it took 130F + to over heat it so I wouldn't worry about it too much. I use my DX in the car dock on my dash for navigation and music all the time and it never over heats. Until I leave it in a closed car in the blazing hot sun, lol.