I think it's mostly useful to keep track of all of the interesting stuff you've found on the web, so you can quickly find "that interesting article you remember

I think it's mostly useful to keep track of all of the interesting stuff you've found on the web, so you can quickly find "that interesting article you remember reading about the javascript 'this' keyword" without searching the entire internet. The social part is, I think, less interesting but occasionally handy (ex. here are all the interesting things I've read about javascript recently: http://www.delicious.com/tlianza/javascript http://www.delicious.com/tlianza/javascript ) and I think the aggregated data could be interesting, but as Digg's woes have shown, it's proven challenging to make a compelling experience around it.