I'm a digg regular, though I very rarely actually sign in and Digg and/or comment. I do visit a couple times a day.
I've had a few posts of mine dugg, and if it gets to the front page it usually results in about 10,000 hits in a day. About a year and a half ago I had one post that was Dugg, farked, reddited and a million other things all at once, and it ended up with several hundred thousand unique visits over the course of a few days. To this day the same post usually gets about 50 or so hits in a day.
I've never been able to successfully digg my own post. It's usually when someone else does it for me.