Out of curiosity I thought I’d look through some of the stats comparing Digg, Reddit, and Stumbleupon.  Digg is killing the competition, but trending down - we’ll see if the new design helps things (when it kicks in).  The big news here is that Stumbleupon is gaining huge momentum… if you believe the chart.  If it’s accurate then Stumbleupon would have a daily active userbase on the plus side of 50%…. which is borderline crazy.  Stats from Compete.com.