NUSPA: National Unidentified Skin Parasites Association
People share stories about their parasites that look amazingly like pieces of lint, particles of dust, grains of salt, and eyelash hairs.
What's up with people who think they're infested with bugs?
Some debunkage from The Straight Dope.
An informational page from UC Davis.
A Medical Mystery: Delusional Parasitosis
Newspaper story that's sympathetic to the problem (with a somewhat creepy picture). An alternative theory is that sufferers don't have actual parasites, but are afflicted with an unusual bacterial infection that mimics some of the parasite-like symptoms.
Morgellons Research Foundation
Some unpleasant pictures of Morgellons disease, a skin condition that mimics scabies and lice.
A google image search for Morgellons returns lots of pictures.