Lion Full Screen Mode w/ Dual Monitor Tip
Use the second screen as a distraction free, uncluttered way to lay out pallets in full screen apps. Here is an example with Omnigraffle. This works well with Keynote as well.
Omnigraffle as a full screen app
This is great but I hate that I can’t choose which screen the app goes full screen to.
Sometimes I want it to be my mail monitor, some time I don’t.