Thank You Mario got off to a good start. It got a ton of traffic from reddit. It got a plug from Entertainment Weekly's "Pop Watch" twitter account, which has 800,000 followers, but that led to surprisingly few actual visits.
When I wasn't looking, delicious.com changed their front page to something other than "this is a really hot bookmark", so making the front page isn't what it used to be. I got only a bit of traffic from the /popular/ pages.
Still waiting to see what effect the Generator Blog has.