I recently presented at the New York SharePoint Developer group on getting started with SharePoint 2010 Online development.
This was a perfect audience as 75% of the room were non SharePoint developers with various walks of life.
The webinar lasts 90 minutes and goes into details on leveraging SharePoint as a platform, hat you need to get started, explaining sandbox solutions and migrating Full-Trust Solution Packages to sandboxed solutions.

The slides are available on SlideShare here.