Other than Google ;-) I have a Rails 3 application that allows users to drill-down by product category and subcategory to list products. There is a detailed product page that contains multiple images and lots of information. I will be "dumbing it down" significantly for the mobile site, but I'm not sure where to get started. Any help from anyone who has mobile-enabled a Rails application is deeply appreciated.
I make pretty heavy use of jQuery also in my app, and am willing to include it in the mobile app if necessary.
Jquery mobile just went into beta 1 a couple days ago. It's worth checking out in my opinion.