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Twine-related
Twine
Twine’s Wiki, which has lots of resources and tutorials
Twine’s Reference Page
Cheat Sheet of common features

AUDIO

Tips & Tricks:
Four Sets of Tips for Recording with a Smartphone – 1 2 3 4
The Top Five Things You Need to Make a Great Field Recording
Audacity Tips and Tricks for Podcasters
3D/Binaural Audio Examples
Creating a Sense of Space in Audacity – 1 2

Source Audio:
The Free Sound Project
Sound Bible
Public Domain Sounds
ccMixter
Jamendo
Free Music Archive

VIDEO

Creative Commons/Public Domain Source Video:
Archive.org Community Video
Prelinger Archives
Public Domain Project
Flickr Creative Commons
DLPA’s Collections Available for Reuse
Wikimedia Commons: Video
Open Video Project (not all CC, but some great technology-based footage)

TOOLS

Clip Converter for downloading online video or audio
Handbreak for digital copies of DVDs/BluRays
LMMS, a music/beat generator