This is a very modest list for now. More is coming.
Thanks to Kristopher Miller for maintaining this handy tool
excellent value-priced yarn
some of the best colors
good online store for Plymouth Galway
Jimmy Beans Wool
good online store for Cascade 220 and Cascade 220 Superwash
the only known source for chenille for the S18
Tragical History Tour
many photos and video stills of the scarves in the Pyramids of Mars section
Doctor Who Cosplay and Costuming
redirects to a highly active LiveJournal community
Doctor Who Costuming at Dragon*Con and Beyond!
Stitches in Time
Facebook group for scarf makers, wearers, cosplayers, prop makers, etc.