Confession time - I did indeed do this. The "WhiteHart" sock puppet was a childish experiment to see if a raging liberal (as opposed to a hardcore right-winger) would garner more karma. Of course I am not a raging liberal, so the experiment went nowhere (as you can see from WhiteHart's comment history).
This may or may not violate Slashdot's account policies. I'm not sure, I cannot find anything about multiple accounts in the FAQ. If it becomes an issue and my regular account were to be terminated, I really have no defense to give.
As I said, the WhiteHart "fake" account never really got off the ground, and I'm surprised to have found myself logged in. According to the FAQ, I cannot delete WhiteHart; I will just have to try to forget about him. Please believe me when I say I've learned a few things in the 8 years since I set up the sock-puppet, and it is something I detest today if I see it elsewhere. Mostly I really do stick to posting my comments under my actual name where practical.