I have no qualms changing in front of another woman, but I don't hang out naked. I've lived with too many women to count thanks to 4 years of college dorms and now living with roommates, and only one of them was OK with wandering around in her bra.

I did, however, know a group of girls who roomed together in college and hung out naked. They kept a sign on their door warning folks not to barge in, or else!

No, I wouldn't be comfortable being naked around my friends at all.

With some women, I have no problem changing or being naked around them. But some women, I'm just not comfortable because I feel that they're more judgmental.
I cannot for the life of me remember who the quote was from, but it was something to the extent of "Women would much rather get naked in front of a man than in front of another woman. Women will judge and compare, whereas a man will just be happy she's naked."

Depends on who it is. If it's a friend, sure, I don't mind being naked around them, though I don't usually just hang out in the buff. If it's a stranger, though, I'd probably only feel okay if it was the changing room at a pool or something.