My concern is that this takes the fun out of participating in these kinds of online communities. Learning and helping others for the sake of fun is one thing, but doing it to beef up a resume is totally different.
Just my thoughts -- I'm speculating here, and there's still a long way to go.
I've been thinking about starting a programming blog with my real name just so people have something to find when they Google for me.
Of course, it would help if I had some public results to point to with my name on them...
So if you google my name and find Andy Hunt's blog or if you find the not me Dr. (PHD in Mathematics) Hunt, do I get a call back? Google is a powerful tool but to randomly believe there is only one person X out there is kind of shortsighted.
As more people get online it becomes harder to differentiate them.