If you have a blog or website, you want statistics, the best place to get them currently is Google Analytics. The statistics are amazing in both detail and depth, with one exception identifying mobile devices.
If you have a Google Analytics account look under screen resolutions, you might see a variety of mobile devices screen sizes, you will have to add them up. In the last three weeks, 10 people viewed this blog on a mobile device. Unfortunately, under operating systems they appear to lumped into the group [not set] and I have trouble identifying them under browsers.
I also have AWstats on this website which does give more details on mobile devices. The mobile devices used in the past three weeks were Windows Mobile, Symbian and Play Station Portable. Because AWstats measures hits not visitor sessions, the data is not directly comparable. If you break it down you would estimate 4 Windows Mobile, 4 Symbian, 2 PSP devices. This is small in comparison to the over 3000 visitors in the same period who used a computer (2,500 windows machines, 440 Macs, 130 Linux and 10 others (sun, beos and RISC)). But as this blog is not optimised or written for mobile devices, it might account for the low traffic.
At the moment mobile device may only account for a small amount this blog and most other websites traffic, I would like Google Analytics to identify the number of mobile device visitors, so everybody can see what is happening and make any changes required.