[rokhayakebe]

http://hellomynameise.com http://friendfeed.com , although I believe it solves a problem by slowly creating another (noise)

What I would really love today is an Intelligentsia. Something similar to a closed and secret community of smart people (which you find here) who share ideas, links,thoughts, solutions to our everyday problems. Think of it as a closed, secret invite only HN.

[maryrosecook]

barbelith.com might suit your tastes. It's not invite-only, but if you apply then it takes months to get approved. Reasonably intelligent discussion occurs.

[nazgulnarsil]

they exist, they're just hard to get invited to because they want to remain small.