Rob Chipperfield compares several platforms and solutions for building cross-platform mobile applications: Titanium, Sencha, PhoneGap, and Nomad.
Kevin Korngut introduces Adobe AIR, a cross-platform runtime environment for desktop and mobile applications.
Peter Friese compares several cross-platform mobile development approaches: Native, Web, Client-side Web, Hybrid, Interpreted and Cross-Compiled, outlining their pros and cons.
Horia Dragomir shares pitfalls to avoid and tips for creating fast and fluid iOS and Android applications with HTML5.
Christopher Judd overviews the capabilities of several solutions for building cross-platform mobile applications: Titanium, Flash Builder, PhoneGap, and Mobile Web.