All the places that Tango-Bravo suggested are wonderful places and I spot there everyweekend, but, another good/great place to spot is on the south side of the airport just west of the FedEx and UPS cargo area, it is called Cutter Aviation, a good FBO, and it has an upper deck part that is great for watching landings and takeoffs on RWY 7L/R and 25L/R. It is shaded by the old Sky Harbor control tower, and every once in a while, they will let you up there to take photos and look around!(except none of my photos from the time I got up there got accepted here. ARRG.) But it is a great place for spotting and there are usually 2 or 3 other spotters up there.