Billiards.com
Offers pool cues and cases, balls and ball racks and gameroom furniture.
http://www.billiards.com
Illustrated Principles of Pool and Billiards
The site includes a large collection of narrated video demonstrations and super-slow-motion video clips, instructional articles and resources, and technical proofs of various dynamics principles.
http://www.engr.colostate.edu/pool/
JSS Billiards
Specialise in 'old cues', both for the discerning player and for the collector of billiards and snooker equipment.
http://www.billiards-snooker.com
Jyu Ben Billiard Table Factory
Specializes in various billiard supplies, including billiard tables, balls, cues and racks.
http://billiard.sportsnet.com.tw/
Mastercraft Cues
Quality English cues for the serious player.
http://www.mastercraft-cues.co.uk/