Anyway, when we first put the site up, we did a little of the social bookmarking including at least one of us threw it up on StumbleUpon. I think we got like 2 or 3 referrals shortly after putting it up and then nothing.
Suddenly, after literally 6+ months of not having done anything but check the Adsense account on that site I see this big spike in traffic. Two days ago there were 37 stumblers sent to the site and yesterday it was up to 60. From the looks of the numbers today is going to beat that. I mean, it's awesome that our traffic is basically up 50% from SU, but I sure wish I knew how in the world it happened so I could replicate it for other sites.
Of course, I also hope it lasts a long, long time. Anyone else have an experience like this with SU?