BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
Product Hunt - A website that lets users share and discover new products
PitchWall - Browse new startups, and submit your mobile app/games startup's beta page here.
StartupBase - Community of makers & early adopters
Startup Buffer - Startup Buffer is a premium startup directory for emerging startups all around the world.
KillerStartups - KillerStartups.com is a user driven internet startups community.