There's a new yarn shop on the market catering especially for those people who love to knit fair isle, feralknitter.com.

From the owner Janine Bajus:

In 2003 I was setting up a Fair Isle color study sub-group of the Seattle Knitters Guild. A non-knitting friend, overhearing the discussion, asked me, apprehension thick in her voice, "Janine, WHAT is a feral knitter?" The name stuck. A feral knitter is someone who loves color knitting, playing with color combinations and garment shapes, and learning about construction and fit.

Visit the site and you'll find yarn, patterns, books, dvds, and workshops all dedicated to fair isle knitting.