I thought I would add an element that the other reviews didn't mention. I go to this library with my kids. The reason the kids jump in the car is that the kids section is just so cool looking. The small kiddie area has this giant cat paw which is a bench to sit on. The rest of the kids section is a castle theme, complete with a draw bridge and tower to read in. They need to put more light to be able to really read, though. It's colorful and bright, not like any library I had available when I was a kid. It makes you want to read and hang out there! If they made all the schools this cool looking no one would ever leave! :)
I am enclosing some photos because if you are visiting or you just have to find a way to kill some time with kids on a budget, this library is great. The kids find the books pretty easily. There is a teen section but I did peek in and it looked pretty hip. I really love that the adult section it is done in a mission style, probably to nod to Frank Lloyd Wright's presence in the Valley. It looks old and traditional and that is rare in a new city like Phoenix.
Other details: The parking is covered--a must in AZ. There are always nooks to hang out by yourself. The staff is very helpful. The check out is pretty easy with bar coding. They also have a good baby program for the really young kids. Great place to rent DVD's and save some money. Oh and the drive thru book drop off is helpful. While you are at it, donate your books and mags to recycle in the drive thru.
And then go run around outside on the Mall area. I don't mean stores Mall, just a big sidewalk area with no cars. Snap a photo at the LOVE sculpture too. All good fun and a smart way to pass the day.