We've been planning for some time to create a cool (possibly animated) introductory film for people interested in the FrontlineSMS basics, but haven't managed to get round to it yet. So, as a stop-gap, yesterday I put together this quick eight minute welcome video, which covers most of the more frequently asked questions.
This video, and others, can be found on the FrontlineSMS Community. The "Quick Start Guide" mentioned towards the end can be downloaded from here (PDF, 1Mb).