Does it hurt to leave the MBP with Lithium Ion battery plugged in?

I have been told by the local Apple Store Genius Bar that I should cycle the Lithium Ion battery down and then charge it back up to increase battery life. I thought that this was not necessary with a Lithium Ion battery. What is the truth here? I use my MBP on my desk most of the time and it is easier to keep it plugged in.
Does it really affect battery life?

tonefox,
Some of your recommendations are out of date:
It is suggested you run it down until the phone powers down and then charge it right up to 100% occasionally. But that is only to recalibrate the oercentage readout.
OP has an MacBook Pro, not a phone, and User calibaration ceased to exist with the 2009 MacBook Pros according to this article:
http://support.apple.com/kb/HT1490
To veehbg,
Anna's link to that artilce is very important to good battery life. I've been around here a long time and the number of batteries that failed early from lack of use far exceeds those that failed for any reason when the usage patterns outlined in that article were followed. i try to run my Mac portables on battery for 30 mins to a hour a day to keep thenm exercized. So dar, so good!

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Toshiba says on http://support.toshiba-tro.de/kb0/FAQ35007L0020R01.htm that:
Totally discharging the battery pack before charging, will allow the battery pack to be charged to its highest capacity
But this and other points do not comfirm information about maximum battery lifetime from http://en.wikipedia.org/wiki/Lithium_ion_battery
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Hi Flutters
The "best" way to "maximize" battery life is always a tricky issue but there are a few important factors to consider:
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Another thing is how to store the battery. The general rule is to discharge any rechargeable battery if it is to be stored for a significant amount of time (say 1 month or more.
The way a battery pack behaves will also vary according to temperature, so a warm battery pack in a warm room will charge much quicker than a cold battery pack in a cold environment, although you should never artificially warm a battery by maybe heating it in an oven.
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Does it hurt to leave the MBP with Lithium Ion battery plugged in?

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