To be honest Stumble started generating visitors since this Friday, after I built up over 100 stumbles myself. Around 50 visits per day since Friday, I guess people started seeing me or something, can’t really say.
Digg, I just digg my own stuff for links, and haven’t seen anything so far from it. I remember the webinar really made a comment on stumbleupon and that it’s the one to pay attention to.