http://www.phonegap.com/
Seems to be the best way to build cross platform mobile apps around. It's open source, free, and includes a cloud based build platform that will build an app for multiple mobile environments all "in the cloud". Easy.
http://ftp.mozilla.org/pub/mozilla.org/mobile/releases/
Download apks of mobile firefox directly and skip the Google market bs. Very useful, was a pain in the ass finding this.
