I instantly thought "Duh. Digg is tanking, but reddit is gaining." I was surprised to see that my inital thought appears to not be true: http://siteanalytics.compete.com/reddit.com+digg.com/
[1]http://blog.reddit.com/2010/07/experts-misunderestimate-our-...
Also, interesting to note that 'top keyword' for reddit is '4chan'.