"Anyone with a bit of a design sense can pic up iAd Producer and build interactive PrimApps allowing people in SL to click through information, adverts, videos etc." Nice YouTube demonstrating potential of iAd Producer in SL.

GREAT 3D instructional design principles: affordances open layout customizeable interactive consistent ... many principles that parallel good website design

Free Second Life Scripts

Torley's guid to making movies - many tips 'n' tricks over the years I've distilled for your convenience. Whether it's video tutorials or story-driven machinima, the basic principles are the same. I know your time is short and you want to get started soon - this guide isn't meant to be all-comprehensive, but is intended to smooth your path so you can get up and running quickly.