My AI does:
The Toss start up with massed Gateways (Zealot, Zealot, Stalker, repeat), build up to a Robotics Facility (Immortal, Immortal, Phase, repeat), get Observers (Usually 3-4), build around 2 Stargates (Pheonix, Carrier, repeat), and then just kick butt.
The Zerg...
Early game is mass Lings + Roaches (Countered by bunkered Marauders+Marines), added to with Banelings shortly after, sometimes Changelings, then Mutalisks, then Broodlords, but they usually get pwnt before they can use them. Vikings ftw.