Everybody loves the 3.4L V6. It has about 40 more horsepower (190hp vs. 150hp) than the 3.0L and is extremely reliable, although I had my 3.0 for 13 years and never had any problems with it. It was a fantastic truck, just down on ammenities and sometimes power. Be on the look out for headgasket problems though. I never had a problem with it but did have them replaced for free by Toyota as a precautionary measure early on.
BTW, I saw the old truck just the other day and made me a bit sad, though after having the 07 I'd never go back exclusively for it. It was weird though being in the new truck and driving behind your old partner in crime though.