Most adults in the U.S. now have cellphones and one in four are using smartphones. With their rich features and capabilities, these devices are driving the mobile app economy.

TIME reported Monday that the iPhone may provide the burgeoning cell-phone gaming market with just the boost it needs to establish itself as a portable gaming mainstay.
Currently, millions of Americans play games on the portable Nintendo DS and Sony PSP every day — but, the story noted, fewer than 10% of cell-phone users in the U.S. do the same on their mobile phones, according to Nielsen Mobile.
Armed with a spate of newly improved downloadable games and ample hardware capabilities for running games, the iPhone seems poised to lure gamers away from …

Figures released earlier this week by Nielsen Mobile estimate that 19 million people (7% of wireless subscribers) have downloaded mobile video games.
Newcomer “Guitar Hero III” and classics like “Tetris” and “PAC-MAN” were among the top-selling games for Q1 2008, according to Nielsen.
The research also shows that since December 2007, total purchases of “Guitar Hero III” have increased each month, making it the most successful game in the fast-growing rhythm game genre.
Overall Top 5 Game Titles (by revenue share):
1.  Tetris
2.  Bejeweled
3.  Are You Smarter Than A 5th Grader?
4.  Guitar Hero III
5.  …