According to the latest edition of The Nielsen Company’s Apps Playbook, the average number of apps that smartphone apps downloaders have on their phones is now 27, up from 22 in December 2009.

Smartphones now account for 25% of the U.S. mobile market, up from 23% in the last quarter according to recent data from The Nielsen Company.

When we look at smartphone data consumption distribution and year-over-year change, we see a large disparity of usage among smartphone users and are struck by the staggering amounts of data used by the heaviest users.

We are at the beginning of a new wireless era where smartphones will become the standard device consumers will use to connect to friends, the internet and the world at large.

Earlier this week, Palm officially announced its new Treo Pro smart phone, due out this fall in the U.S.
But this new offering isn’t expected to reverse Palm’s fall from dominance in the U.S. smartphone market, Wired reported Wednesday.  Instead, Wired noted, the company is pinning its hopes on its next smart phone, coming in 2009.
The story cited data from Nielsen Mobile, illustrating Palm’s steadily declining share of the U.S. smartphone market.