Here is a very informative presentation on how to make your Rails app mobile-friendly: http://bit.ly/16gxa5. I have been using an Android phone for a while, and I can see how frustrating it is to view sites that are not optimized for mobile use. I’ve already submitted a entry to the ADC that addresses precisely this problem, but it’s not perfect (more on this soon). Of course, the best way is the sites do it themselves.
UPDATE: Looks like something very similar: http://www.jqtouch.com/