Is leaving my MBP plugged into mains a bad thing?

Is there an FAQ on this kind of stuff anywhere? I bet my questions are very common.
1 - Is leaving my MBP plugged into mains power a bad thing? Someone told me today that it's bad for the battery. I've had the thing about 6 weeks now, yet I've only gone through 5 cycles.
2 - I've not yet run the battery completely down at all. Is that good/bad/doesn't matter?
3- Is allowing the machine to completely drain itself of power (till it conks out) at all likely to damage it?
4 - What's all this about battery calibrating?
As I say, if there's a FAQ...
Cheers!

By and large, laptop batteries today are maintenance free. Just charge them when needed and don't spend a lot of time worrying about it. Some people seem absolutely **** bent on finding something they can fret over with their laptops instead of just enjoying using them. Learn from their example, and don't allow yourself to fall into that same trap.

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    panic(cpu 0 caller 0xffffff8002217cc2): Kernel trap at 0xffffff800232b4e8, type 14=page fault, registers:
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    0xffffff81ea5dbb90 : 0xffffff8002234b73
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    0xffffff81ea5dbda0 : 0xffffff800255e5a1
    0xffffff81ea5dbdd0 : 0xffffff800255559f
    0xffffff81ea5dbeb0 : 0xffffff800235879b
    0xffffff81ea5dbed0 : 0xffffff8002342e24
    0xffffff81ea5dbf40 : 0xffffff800234d027
    0xffffff81ea5dbf50 : 0xffffff800264ba86
    0xffffff81ea5dbfb0 : 0xffffff8002235376
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