Actually, Apple is trying to extend its AppStore success to the Mac platform...There is a constant tension between openness and closed, which is very much guided by corporate profit. Up to this point, Apple has won BIG; the question is where does the world go from here.
Mac App Store for OS X 10.6 and 10.7 unveiled, coming 'within 90 days' -- Engadget
One day the Mac ecosystem could be as closed as the iOS. Maybe this is St. Jobs' way of fighting viruses/trojans...
And don't forget, this is not about open vs. closed, but fragmented vs. integrated...
Diogen.