This is something I thought about a while ago and the experiment YouTube are currently running reminded me of it.
I've always thought that it lends the discussion a bit more credibility and often results in a more worthwhile conversation if people are posting under their own names instead of an alias. It's easy to act differently than you usually would and in some ways you can construct a different personality for yourself, saying different things and even having different opinions.
I was interested and surprised by how many people chose to take part and use a photograph of themselves as their avatar and I think that has been a big success. I don't see why it would be that much different if we all called each other by our real names.
So, would you be interested in posting under your own name if it was mandatory on NeoGAF?