Not really. I'm not confident it would work with all the modifications I've made to the software, and it's quite expensive for anything but the very basic package. Also, the user-side app costs $3. I seriously doubt enough people would use it for it to be worth the effort.
A more functional but mobile-friendly theme is on my to-do list, but it's a pretty low priority. I want to make sure the new software and server don't have any hiccups over the course of a full season before I go tearing things up again.
just saw this bumped, aside from embedded gifs- the full site runs great in moble browsers- I doubt an app would improve any thing