Lunchclub - Curated 1:1 professional connections
Great F*cking Startup Advice - Strongly worded suggestions for startup founders
Serendipity - Serendipity is a PHP-powered weblog engine which gives the user an easy way to maintain a blog.
Startup Notes - Most actionable advice from each Startup School speaker
Lunch Roulette - Collaboration by grouping coworkers randomly for lunch.
First Search - The world's best startup advice, curated and searchable.