The iPhone entered a mature market and has taken a 25% share in 3 years. The iPad is breaking ground in a new niche and effectively has a 100% share. Well, minus the 90 JooJoos that sold
I think magazine publishers would do quite well to target the iPad. Sometime this summer or later in the year, the serious competitors will enter the market. The windows slates will be a non-starter, but the android ones will occupy the "what to target after we've created our iPad app" niche
Lee