Full disclosure - I founded a social bookmarking site that launched its beta about a month ago. Obviously I'm biased towards loving my baby and not loving Delicious but I'm genuinely interested in why people like Delicious.
Don't really care about the whole "social" aspect myself, so it would be nice if there aren't any new features in that area that distract you if you don't need 'em. That includes cluttered interfaces...
Funny I have been thinking about hiding/de-emphasizing the social stuff on my site. I thought it was a good idea when I added it. But now I'm thinking that people have so many options when looking for new links that when it comes to their own bookmarks - thats all they want to see.
I migrated my delicious library to it in a minute or two.