Fantastic on concept and content. Poor on web development.
Then, when you post something in Ubuntu Linux with Firefox, it tells me that the barely readable captcha was mistyped. The screen also flips around wildly in a loop every few seconds.
If it were me, I would have made a straightforward site with static HTML pages (so that I could take advantage of HTML compression) that are generated every 2 minutes on the fly. When you post something from a normal HTML page, it would go to a PHP page for processing and then would update the static content after about 2 minutes. To dress it up, I would use CSS. There would be no stupid AJAX or DHTML.
If you think about it, the site could really be designed such that there are only about 200 pages on the web server at a time. The rest could simply scroll off (be removed). Having a script generate 200 pages every 2 minutes on a mirror, then replicating that to other mirrors, would not be a huge deal if done properly.
Dang, I wish I had the time, a T1, and a beowulf cluster. I could show how such a site could be made.
However, I appreciate what digg.com has done. It has changed how we think about tech news.
Another alternative, which loads much faster, is reddit.com.