I use an Ingraham digital timer on my freshwater I picked up at Wal-Mart. It does a wonderful job.
I have a Coralife Power Center for my saltwater setup. It's not as easy as the digital one, but I have found that it is fairly accurate. It turns on and off at the same time every day...currently, I have it timing my 46 gallon and 10-gallon QT lights...I'm going to have to figure out how to do this now that my new lights have 2 cords for the daytime lights...but I'm sure it'll work out!
I never counted before, but I'm using 12 outlets right now!!! And when my new lights show up tomorrow, I'll be using 14! I wonder how much electricity these aquariums actually burn?
38 Gallon (Freshwater): 1 Green Swordtail, 3 Yo-Yo Loaches, 1 Clown Pleco, 1 Blue Gourami, 4 Otocinclus, 7 Cherry Barbs.
46 Gallon (Saltwater): 60 pounds Lalo Live Rock, 60 pounds aragonite sand, 1 Coral Beauty Angelfish, 1 Peppermint Shrimp, 1 Mushroom Coral, 1 Emerald Crab, various snails and hermit crabs.
10 Gallon (Saltwater quarantine):