Product Hunt - A website that lets users share and discover new products
WebTechResources - Find best tech resources everyday, sorted by people like you, ready to select and use.
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.
PitchWall - Browse new startups, and submit your mobile app/games startup's beta page here.
JSter - JSter is a community-driven catalog of the most useful javascript libraries.