I just discovered digg.com a few days ago, and I am hooked. So far, it seems surprisingly good. IMHO, it is almost as good and even surpasses Slashdot in many aspects: traffic (although alexa.com might be misleading here), volume of posts, fresh news, and of course better overall quality of discussions. I am still going to Slashdot every once in a while, but I started to notice the lack of salient articles there.