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Ben has been talking about OS X sleepage on the MacBook Pros.

By default, sleeping causes hibernation (save to disk). This has caused one issue for me when the machine didn't come back happy. It is also a lot slower than my powerbook that keeps things in memory.

Ben had the problem that since the MBP does have the backup battery, when he turned off his computer it all went away.

This is why I flip on hibernate mode before I take out the battery:

alias hibernateon='sudo pmset -a hibernatemode 1' alias hibernateoff='sudo pmset -a hibernatemode 0'

• on == it will save to disk (slower but safer-ish)
• off == keep in memory baybee (fast but don't lose power)