Does anonymity defeat the purpose of social bookmarking (and social networking in general)? I agree that it would be an interesting social experiment, though I'm not concerned if people are pandering to pg, nickb, or anyone else.
Submissions could be made anonymous for a few hours. I think you would get more interesting items on the front page.
If the pandering is a problem, you'll still get some of the same sites being voted up (paulgraham.com, techcrunch etc), but some other more interesting ones might break through.
Still, I would hope most of us look past those things anyway.