I finally broke down and purchased a new set of Husky Liners for my 2008 Tacoma. I had been using a set that I orginally bought for a 2001 Tacoma and I also used them in a 2005 Tacoma and then for a couple of months in my 2008 Tacoma.
I have decided that you cannot wear these liners out. Anyway the new ones fit better because they are actually made for my truck. The only thing I did not like about the newer set is that they do not cover the area to the right of the gas pedal as well as the older ones.
I fixed this by cutting up one of the older mats and attaching it to the carpet beside the gas pedal for a little more protection.
When I first put these in I used velcro to hold the edges down, after a week or two the stay down on their own.
I also looked at the Weathertech liners that most on here use but I just like the look and cost of the Husky's better ($64.95 for fronts only including shipping). I'm sure the wearthertechs are good liners too I just prefer these.