The Speedo Pace Club is commercial yes, but has some really nice technique videos, plus an iPhone app for you to track your training, find pools nearby and do some social thing with your swim friends too. And there are blogs of famous Team USA swimmers. I like.
Here it is Dana Vollmer world champion in the 100 butterfly demonstrating how to do the Butterfly 3-3-3 drill.
And here is a drill I must confess I’ve never seen. Must be some kind of ‘competitiveness drill’. Via Jorge Aquado.