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"You know the drill. Close your laptop's lid or select \"Sleep\" from the Apple Menu and it does just that - it goes into low-power mode, or \"sleep.\" That's just not good enough. Check out SmartSleep, which puts your MacBook or MacBook Pro into either Sleep Mode or Hibernate Mode, depending on several factors. For example, if your battery is at 20%, SmartSleep puts your Mac to sleep and hibernate. If it's down to 5%, it goes right to hibernate mode, preserving items in memory. Otherwise, it just sleeps as it typically does.Finally, you can select any of these settings as the default for your machine. SmartSleep is free.[Via Download Squad]"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2008/02/28/put-your-laptop-to-sleep-with-smartsleep/>