Related link (via http://salafiyyah-kuwait.blogspot.com):
"Protecting oneself from shaytaan and from harm through the Words of Remembrance found in the Authentic Sunnah - (Part 3)"
The 4th section titled: "Yawning is from shaytaan" includes some of the hadeeth mentioned in the Sahab link above as well as more - may Allaah reward the brothers at SalafiyyahKuwait.