A few Vimeo users asked me to share the encoding settings I use in iMovie 08 for my HD videos. So, I recorded a little tutorial. The settings in this tutorial will produce a large video — like... really, really, big — but they look great!
If reasonable file size is what you desire, watch Bernard's tutorial here: vimeo.com/348114
This was the tutorial I followed when I started with HD @ Vimeo.