New developer tools releases by Adobe have made building cross platform solutions considerably easier, and potentially cheaper. Now it is possible to build one application which can be installed and run on many platforms. Just to prove the point, we built an ArcGIS application and installed it on multiple devices. The following link shows videos of the same AIR app running on the IPad, Android and BlackBerry PlayBook. So one code base running on multiple platforms:

ArcGIS running on IPad, Android and BlackBerry PlayBook

These are exciting developments. The appeal of mobile devices is considerable. Now we can more easily build cross-platform mobile applications, we can start launching new location based tools, available to all mobile users. And built at a reasonable cost.