These cast ons are the ones I use the most - different applications require different cast ons. The top of socks need to be stretchy, whereas an afghan or scarf cast on needs to be firm. Most knitting patterns specify which cast on to use.
Knitted cast on
http://www.youtube.com/watch?v=-nJKC2xT0Q4
E-wrap cast on
http://www.knittingatknoon.com/Ewrap.mpg
Cable Cast on
http://www.youtube.com/watch?v=DWB-ND5Sb7s&feature=related
Long tail cast on
http://www.youtube.com/watch?v=8wUPQDYtoy0
Twisted German Cast on
http://www.youtube.com/watch?v=hu6irzD9sJ4
Twisted Purl Cast on
http://www.knittingonthenet.com/learn/twpurlcaston.htm
Channel Island Cast on
http://www.youtube.com/watch?v=-nJKC2xT0Q4
Judy's Magic Cast on
http://video.google.com/videoplay?docid=-8436589185992277807#
Turkish cast on
http://video.google.com/videoplay?docid=-8436589185992277807#docid=4176471643313102973
Figure 8 Cast on
http://www.videojug.com/webvideo/how-to-cast-on-a-figure-of-8-stitch
Provisional Cast on
http://www.youtube.com/watch?v=R3J-sUx_whE
