Jim Geduldick (@FILMBOT) has an new x264 Encoder Tutorial for as an alternative to the QuickTime codec for producing H.264 files on the Mac (embedded below).
This video tutorial is on Already Been Done, a skateboarding resource. As usual, there's are other tutorials, for example one by Satya Meka, Quick Tip – Better Compression With X264. And there were tips and utilities before that, some found in More on Quicktime’s H.264 gamma bug at AE Portal.
Jim Geduldick: H.264 files / x264 Encoder Tutorial from Already Been Done on Vimeo.