UK analyst Wireless Expertise is the latest to try to put a number on future growth of the mobile applications market, claiming that it will leap from $4.66 billion this year to $16.6 billion by 2013.

That’s global, as compared to yesterday’s prediction by Yankee Group that the US apps market will be worth $4.2 billion by 2013.

Wireless Expertise’s forecasts are based on an estimate that there’ll be 1.6 billion smartphone users by 2013, making up 28-30% of the overall mobile market.

Read more here.