the mobile theme has several problems. The first is that it apparently does not remember (set a cookie?) that I choose the mobile theme; I have to reselect it each time. Selecting the mobile theme on a smartphone (mine is a Blackberry Storm) is a big headache because the theme choice is tucked way down at the bottom. In the mobile theme, if I remember aright, logout is tucked between several choices that are more useful to staying logged in (changing theme?), meaning that it's difficult to avoid logging out unintentionally.
At the bottom of each page of posts, it would be really nice if the mobile theme had a "top" link rather than having to scroll back up through a long page. It would be really nice, too, if that "top" link were kept well away from any log-out button.