I carry mine asleep all the freakin' time... I don't like waiting those 5 seconds for it to boot up... ... ... 
I take it everywhere and never shut it off fully.
Hopefully I haven't been misinformed.
This is one of those features that seems to amaze PC users
No doubt. You can carry any machine (Mac or PC) around in sleep mode, even a desktop if you have long enough cords. It puts the running state into RAM, and parks the drive.
What else is there to discuss?
A lot of PC users have been told that carrying it around in any state other than "off" will somehow damage the machine or reduce its longevity.
One thing that hasn't been mentioned yet.
Make sure you unplug all USB devices before sleep/transport. You wouldn't want the Mac to wake up because of some random USB device while you're climbing Mt. Everest with the MB in your bag.
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Any particular reason why you resurrected this old thread with that comment?
Things Not to Do
These are usually not instantly bannable - but will likely get you edited and/or warned.
1. Useless posts. Do not bother making posts with only one or two words (e.g., LOL or a smilie, or post simply to have the first reply in a thread. Such posts waste everyone's time and will be deleted. Posts saying "I agree", "+1", "me too", or the equivalent are also routinely removed.
from the MacRumors Forum Rules
Any particular reason why you care?
Yes. I'm here for almost two years, and once every month or so (more often though) I come upon a thread resurrected for no other reason than posting LOL or a SPAM link or whatever the poster seems to think about, but it is rarely useful in any way.
Thus my interest in those necroposters, often ones who just registered to make that one post and never coming back again.
And I have developed an eye, and maybe some obsession, for those necro-threads. I can spot them in Forum Spy, but that may also be due to me being here so often.
Are you satisfied?
Any particular reason why you care?
Any particular reason why you care that he cares?
... not that I care!
Any particular reason why you don't care that I care that he cares?