This is certainly not the first post I've linked to on the topic of StumbleUpon for business marketing. This article, however, from Tamar Weinberg of 10e20, seems pretty comprehensive. StumbleUpon has evolved into an interesting bookmarking site that has seems to have developed an unusually high following with online marketers. The site has come up two additional times n conversation here at bizSugar this week, once in an interview with Matthew Ringer of SmallBizBee for today's post on the bizSugar blog and a second time in an e-mail exchange with fellow bizSugar member Joel Labava aka The Franchise King. If you haven't yet had the chance, stop by to see what all the excitement is about.