This week, I needed a quick mobile (smart phone) proof-of-concept for one of our web app products. Since speed of development and broad platform support were more important than native device features, I took the mobile web route. And as a jQuery fan, I chose jQuery Mobile (JQM).
Native app development requires real devices or emulators (such as the Android Virtual Device, AVD), but with a pure mobile web app, I was able to just use Chrome with the nice Ripple extension. This removed all delays from the code-run cycle: yet another benefit of the mobile web / HTML5 world.
jQuery Mobile is perhaps the go-to framework for HTML5 mobile web apps. Certainly for those of us who are sold on the benefits of jQuery.