Long term Battery preservation...

A genius at Apple retail told me this tip for longterm battery life:
don't leave the computer plugged in while it sleeps. It's cool to let the HD spin down and let the screen sleep, but down let the system sleep without pulling the AC.
He also said that when it comes thime t do a weekly calibration, that letting it dry up all the way is sort of a wives tale... In fact, its better he says to let it go down almost to 0 and similarly not to let it get to full capacity on the recharge (this is achieved automatically whenthe AC is in and the system is still awake. Basically the system tricks the battery into not charging all the way which for some reason save it in the long term.
Does any of that make sense, and if so are there any other means by which one can keep the battery lving and lasting longer (short term and long term suggestion welcome, many thanks in advance.

It seems geniuses ain't what they used to be...
1) You can choose to have the disks spun down when attached to external power.
2) I'll take the word of the engineers who designed the device and chose its components over that of an hourly guy in a retail store any day. By that I mean I'll follow Apple's published instructions on maintenance. It's not that they might not discover a better way, but I just consider them a lot more authoritative.
The whole power and battery area seems rife with folklore. Folklore and computers don't mix!.
Take your advice from the horse's mouth. Follow Apple's instructions and recommendations. They publish a great deal of information on-line. I have to believe it's generally well vetted by their engineering staff.
Randall Schulz
iMac 20" Core Duo; MacBook Pro   Mac OS X (10.4.5)  

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