I think I heard that some baby powder will help with squeaky belts and holsters.
I picked up some of Rusty Sherrick's Hyde Glyde also, that seems to work too. It appears to be the same as Wilson Leather's conditioner and cleaning creme for jackets and such, but I'm not positive.
I've had a Rafter sharkskin 1.5" belt for more than a year now and it's still going strong, I wear it daily, there is some wear where the buckle is, but other than that no problems.
I just got a belt from someone on FALfiles who buys them at an amish community in Ohio, been breaking it in now for a week or so, seems nice so far, it's 1.5", tapers to 1" and is a domed instead of square like my Rafter belt. and it has snaps instead of the chicago screws holding the buckle in, not sure if that's good or bad. Nice belt so far, same price as Rafter's.