In their first report, Comscore and Telephia show some interesting data about mobile web use. It looks like checking weather is very popular.
Another thing I found interesting: Google Mail has only a fraction of the users of Hotmail and Yahoo Mail, both by desktop and mobile users. I switched from Yahoo Mail to Gmail last year and am much happier with the speed of Gmail. But it looks like more PC and mobile users still use Hotmail and Yahoo Mail.
I just added Telephia to my Google Alerts. This is a company that I want to track, since some of our companies are in the mobile content space and most of our other companies will need to develop mobile applications in the future. Any time they issue a press release about mobile application usage or mobile web market share, I want to see it.