Skeptic's Dictionary: Biorhythms

Overview and analysis.
http://www.skepdic.com/biorhyth.html

Trust the Bible

Lists Bible verses claiming that evil spirits are active in astrology, fortune-telling, mediums, and the occult.
http://www.trustbible.com/astrology.htm

Casting Lots and Rolling Dice

A look at casting lots and using chance to make decisions.
http://www.spirithome.com/paralots.html

Psychics

Christian site argues that psychics rely on "familiar spirits," which are devils.
http://www.teachingpages.co.uk/minilesson/psychics.html