The auto-hibernate ("Safe Sleep") feature in Tiger and Leopard on newer Macs really needs the ability to be fine-tuned. It's one of the first things I typically turn off. While not perfect - there should be a GUI component - imagine my surprise when I went to dump my Safe Sleep and sleepimage from my newly-installed GM version of 10.5. pmset's hibernatemode still allows turning the feature off altogether. But look at this new mode:
