I thought that I'd drop a few photos on this thread. Keep in mind that I was trying to do this head unit install only during my lunch breaks at work, so it didn't turn out perfect, but still looks good unless you know what you're looking at. I installed an aftermarket double-din DVD/NAV unit that is designed to fit into the '04-'07 Toyota's. I was tired of the flip out screen, and I had installed on in my wifes highlander.
At night while listining to Slacker Radio
I also built a custom center consol that holds a Kicker L5 10" sub. If you look at the dash, you can see the gain controll for the sub (and the iPod cable). I run a Kicker 750.5 amp, 6.5" MB Quart components in my front doors and 6.5" Diamond Audio in my rear doors. Amp is secured to the rear wall behind the seats.