Jigs, plans and tips:
•  Longworth chuck (http://www.crwoodturner.com/longworth/)
•  Turning a helix
   (http://www.turnedtreasures.com/project.html/helix/helix_pg1.html)
•  Software for segmented turning: (http://www.turnedwood.com/software.html)
•  Oval designs (http://www.angelfire.com/wa2/go3/oval/oval.html)


more later.