Go straight to
www.tundraracing.com.
They sell a very slick kit that you (probably with a little help) can do in your driveway in a few hours.
I talked to their design guy a few weeks ago; he was finishing up a big brake kit for the pre-07's, which was pretty much the same as the one for the new trucks. After we had talked for a few minutes, we reealized we knew each other! They are located across town from me. I went over during lunch, and saw the kit for my '05 DC laid out on a table. High quality stuff!
They are also introducing a rear bumper replacement valance. It is pictured on their homepage.
I'm trying to save up for the lowering kit for my truck.