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I've signed up for them all but I must admit I've lost a lot of the cards and numbers so they aren't doing me much good I have two or three with substantial miles accumulated. These days, so many airlines are connected you can get by with just one or two even if you fly with a bunch of different lines!
I belong to three (well there are a few stragglers in which I have miles but I don't fly them much anymore) with the goal of one per airline alliance. So I'm in Finnair for One World, United Airlines for Star Alliance, and Continental for Skyteam.
No matter where in the world I fly, the miles are useful beyond just the individual airline.
I don't have more than five, but I've lost count...I know I have AirTran and Southwest, and possibly US Airways...? It doesn't really matter since I don't really have enough miles/points in any of them to accomplish much. Ah well.