The problem with Slashdot is that they’ll have an interesting story which will disappear as new stories push it down the page, like a blog. Digg stories stay near the top as long as people are clicking the “digg” button. Digg just doesn’t have the sense of community yet. I read Slashdot for the comments more than links, Digg is more about getting a ton of interesting links in your face as fast as possible.

Slashdot would probably be more profitable than Digg, all things equal, because Digg is sending you to other sites, Slashdot keeps you there, reading a discussion. Sticky eyeballs and what-not.