I'm getting ready to pull the door panels on my truck and install some sort of sound absorbing material. I would like to know what kind of experiences members here have had with what type of products.

I'm on a budget, so cheap is good.

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

Make sure any material you use does not hold water. This will rust your door and make it go away. Then it will be real quiet. In the late seventies and early eighties Mopar used a heavy tar paper substance glued directly to the sheet metal with what looked like undercoating tar. It worked pretty well. You would likely want to put some kind of metal prep on first to stabilize any rust that is on the surface.

Sam

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Dynamat works well, but is not cheap(inexpensive) by any means.
I had a 1964 el Camino(Daily Driver) that I did a horrible floor pan patch job on, so I rhino linered the whole floor, firewall and bedwall. Then I just installed carpet with jute backing.It was like riding in a Rolls Royce! No road noise at all. I sprayed under-coat on the car when I put the floor pans in.(not really needed in Texas, but I didn't want the welds rusting)
I am not suggesting you do this, especially to doors, but it worked well for this application.

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1964 Dart GT

Dynamat works extremely well. I used it in the floor and doors of my mustang. The difference was like winter in Montana and summer in Hawaii. But its expensive!

There's a few sellers on eBay selling rolls of sound deadening similar to dynamat for half the price. My brother in law swears by it. I plan on getting some when I redo the interior in the Duster.

There's also the home depot solution. HD sells rolls if asphalt roofing material. It doesn't have the gravel in it like shingles. I've heard of guys using contact cement to bond it to panels with pretty good results.

Door skins are replaced every day by the hundreds, perhaps a body shop / auto paint supply store would have something available for this application in a spray can. Follow the directions on the can.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

Some really good info on sound deadening here http://www.sounddeadenershowdown.com/cgi-bin/index.cgi

A cheaper substitute for dynamat style products is Bitumen based flashing tape. It comes in rolls of varying widths and is generally used as a sealing tape on roofing panels.

I used stick on ice guard as used under roofing along the edges to prevent ice backup under the shingles. It worked well and was less expensive.