Best way to preserve battery?

I just got a new macbook and I was wondering which of the two scenarios will best preserve my battery for better quality, or if it makes a difference at all:
1) Charge my battery to full, unplug, use up battery to empty, and plug in to charge to full again. Repeat cycle always.
2) Keep my macbook plugged in at all times when possible.
Thanks everyone.
MacBoook Mac OS X (10.4.8)

I will try and answer your first question as best I can, as I am not completely sure about this.
What I have heard, is that the computer runs completely on the power adapter when plugged in. But the charger is also charging the battery at the same time. I'm pretty sure that the MacBook's power adapter, has two circuits inside. One is for powering the computer, the other is for charging the battery.
Your second statement is also partly true. The battery that is used in all current Apple notebooks are designed to automatically be used on battery no matter what from time to time. This is to help prevent the battery from dying a premature death by being plugged in all the time. What happens is that when the battery reaches the fully charges state, the computer begins to run on battery power, while still plugged in, but only for a short time. (Something like 3-5% I think.) This is to make sure that 1. the battery does not overcharge, and 2. the battery's ions move around a bit. (That keeps a battery healthy, thus, using the computers battery is good for it...)
Your third statement is also partly true. Batteries are only perfect for up to 300 charges, or so Apple says. Once you get to 300 cycles, the battery is not dead though. Apple states that all of their batteries are designed to hold about an 80% charge at full capacity once they reach 300 cycles. This said, your battery is going to die weather or not you leave it plugged in all the time, or use it like it is intended to be used. I for one recharge my battery whenever the low battery warning comes up, I don't wait for the computer to go to sleep, or I recharge it when it is low if I know I will need it later.
I still stand behind my recommendation that not leaving a battery plugged in and using it normally, will allow it to9 last longer than leaving it plugged in all the time. Here is a real life example that I personally have seen: My dad purchased a Gateway notebook 5 years ago, he has it plugged in all the time. My aunt purchased a IBM ThinkPad about 6 years ago, and only plugged the battery in when it died. Guess what, my aunt's old notebook runs on battery for almost 3 hours after 6 years, my dads battery on the other hand last about ~30 minutes at the most.

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