Delta/Air France: Delta, Air France, soon Aeromexico and probably Korean.
OneWorld: AA, Cathay Pacific, British Airways, Qantas, Finnair, Iberia. (Canadi>n is dropping out)
Star: United, Lufthansa, ANA, Mexicana, Singapore Airlines, Austrian Airlines, Tyrolean, Lauda, Thai, Air Canada, Air New Zealand, Ansett Airlines, Varig.
Qualiflyer: Listed above by ZRH.
Wings: Its up in the air. The original members would have been Continental, Northwest, Alitalia, and KLM, but KLM nixed its alliance with Alitalia and now Wings' future is uncertain.