Business Week writes:
The profusion of online "app stores" for mobile-phone software programs is a nightmare for developers trying to pick which platforms to target.
Imagine if makers of, say, vacuum cleaners needed to design different models for different stores. One for Wal-Mart, another for Target, another for Tesco, and yet another for Carrefour. That's a bit what it's like to be in the business of writing programs for mobile phones.