Surefire's tutorial
http://www.webgfxcenter.com/tutorials/tutorials.cfm?ID=37

Shape shifting
http://www.animation.about.com/arts/animation/library/weekly/blflashtutorial2a.htm

http://www.itc.utk.edu/itc/courses/dm145/tut_shape_tweening.html

Almo's site
http://www.netkontoret.dk/flashecho/tutorial/shape/indhold.htm

Flashplanet tutorial
http://www.flashplanet.com/tutorials/shape_tweening.html

Saturn tut- in Flash 4, no matter
http://saturn.ee.port.ac.uk/www/student_www/web_company/flash3.htm