Some people are concerned about identity theft, and I believe it's a valid concern, but only if you have personal information about yourself listed with your name, somewhere out there. *gestures vaguely*
I don't see a problem if your name, and your opinions, are all you reveal.
I'd guess that the majority of us are confident that we can deal with anything undesirable that may befall us through the use of our real names. As Erin said, I'll stand behind anything I've said online, as I would in person.
Besides, my real name is much easier to pronounce than the pseudonym I used to use
