arma coatings is another and a big bonus i've seen with it is the ability to tailor the coating to your specific need. the can do it very smooth or very rough, hard or soft. i have been studying this topic for some time and have been in contact w/ the company about doing my vw bus and vw thing. i have some very weird needs in what i'm doing and they are the only company that seems to be able to work with me and they can spray it much thinner than rino or linex which works for me but you can get it as thick as you want. i haven't worked out the cost yet but they can surely give you a ballpark on a truck bed. they also do custom colors, stock colors and of course black.

http://armacoatings.com/index.html

I have a Rhino Linings in my SD, and I LOVE it. I saw Line X at the Stugis Ralley, but didn't care for it. i like the texture of the Rhino. And like everyone else has said, nothing slides on it! I LOVE that. I moved from SD to MA. and had the bed of my Super Duty loaded, not a scratch or dent in it. As long as I have a truck, I will ALWAYS have a Rhino Linings spray on liner.