Tips I can vouch for:

• What to do with that last fiddly stitch when binding off.  http://acengineeredknits.blogspot.com/2010/04/knit-bind-off-last-stitch-boogaloo.html

• Judi’s Magic Cast on video – thanks to Cat Bordhi: http://www.youtube.com/watch?v=lhBIS0AhhQY

• Knitting backwards – without twisting your stitches  http://vimeo.com/21845093

I haven’t tried these but want to share them anyhow:

• Tightening a baggy neckline: http://www.yarnharlot.ca/blog/archives/2008/02/24/hooking_because_i_have_to.html
• More complicated knitting backwards demo which has multiple stitch types: http://youtu.be/Or0xftjwxYk
• New sock heel everyone is raving about – the fish lip kiss heel by Sox Therapist: http://www.ravelry.com/patterns/library/fish-lips-kiss-heel