I am currently using a mix of Swheat Scoop and Arm & Hammer Super Scoop, but after reading this thread I'm going to try Fresh Step.

For tracking, because both of our litterboxes are on carpeted floors (due to major lack of tiled flooring in my apartment), I have a little mat I picked up at PetSmart in front of each box. It works great - I'd say it catches 90% of the litter off their paws. Each time I scoop out their boxes, I pick up the little mat and shake whatever it caught out, back into the box. Any litter it doesn't catch, along with any litter they throw out of the box via vigorous digging (which usually isn't much) gets Dustbuster-ed up every 3rd day or so. The feel of them (kinda like a horse's curry comb is the best way I can think to describe it) could bother kitties with sensitive paws I suppose, but Tito and Sophie don't mind at all. They generally are not picky cats about anything - food, litter, whatever. Anyway, you can see the litter mat here. It comes in different colors. Mine are blue.

Catnapper - that article you posted recommends completely changing all litter and disinfecting the litterbox weekly. I must admit I only do that about once every 4-5 weeks. Am I the only one guilt of this? I hope not!