One of the hot topics right now is mobile content. A lot of developers are trying to figure out the best way to turn a complex media rich website into an app so visitors can use it on their handheld device. I've come up with a solution that is both device and software independent, and I'm surprised more blogs aren't using it.
A few weeks ago I changed to my current WP theme. I didn't draw attention to this at the time but I also added a theme switcher widget. One thing you might not know is that there are many free themes out there, including one called Carrington Mobile. I find it quite usable on my iPod Touch. I haven't tested it on other platforms yet, but I expect it to work fine.
P.S. If there is a theme you'd like or if there is a better free mobile theme, please let me know. I'll see if I can add it.