Leaving Macbook Air plugged into ac adaptor?

When using the Air at home, is it ok to always leave the computer plugged into the AC adaptor, whether in sleep mode or in shut down mode? The magsafe plug on the computer stays green because the battery is charged. If I unplug the ac adaptor, even for a day without using the computer, the plug is first amber as some charging takes place.
What is the best way to use the computer at home to preserve battery operation over the long term?
thanks

Some other users already hit on the main points...
One thing worth mentioning, the purpose of the MacBook Air was to be super portable and I'd imagine for the typical user who purchases the machine they're anticipating being very mobile with it. I know on mine, I've already crossed the 100 charge cycle threshold and the machine is only about 3 months old. I use it a lot, both plugged in at night and unplugged during the day.
No matter how you use your battery, charge the machine, or leave it plugged in, ultimately the battery's longevity will be depleted. There are ways to prolong it, but it's impossible to prevent it. My advice to you, is to use the machine how you see fit.
Regarding charging at night, there's no evidence to support that leaving the machines plugged in overnight (on, off, sleep or otherwise) is problematic. I personally unplug mine at night, unless it requires charging. But again, that's a personal preference.

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