It’s quite interesting to go into the browser / OS marketshare statistics Net Applications is gathering.
Within the last 12 months, the marketshare of Apple Mac OS X powered computers increased from 6.38% in Feb 2007 to 7.57% in Jan 2008 - a growth rate of about 19%. This great news for the Mac community - but what’s really surprising is the significant marketshare of iPhone surfers in the last month. The iPhone was introduced to the US market on June 29th 2007 - and in Jan 2008 it’s internet surfer worldwide market share is 0.13% according to the Net Applications. Focussing only on the US market it’s share is even higher at 0.20%!
It looks like the iPhone really fuels the use of mobile internet.

Source: Net Applications