Recently came across producthunt which people can add, comment and upvote new apps and web things. I'm finding this really intriguing and have already curated a list of things that I want to check out further. Some interesting stuff, such as runnable.io for running test servers from git commits and minute which looks useful for meeting notes.
From producthunt I have been introduced to githunt.io, the equivalent for GitHub and nuu.in which is the equivalent for finding new shops/restaurants/happenings in your area. There seems to be a surge in social curation tools on the web at the moment and I'm already addicted to producthunt.
Edit: Got an email from Producthunt a couple of days after this post with a link to a list of Producthunt for X. People do love their lists.