Mobile themes for Pro Sites/MU

Hi All,

I hear that mobile devices are pretty big when it comes to the web now days. I'm a little late to the party, as usual. Anyone here using a great mobile theme on Pro Sites or simply on a MU network?

My model is a network built for business websites. My clients typically are average or below average computer users, so it needs to be something that is simple to setup, works out of the box and compatible with their main theme without jumping through flaming hoops.

I'd love to hear your input!
Thanks!

Scott