Startup Stash - A curated directory of 400 resources & tools for startups
Goodreads - See what your friends are reading.
Stackshare - StackShare is a comprehensive website that gives its users the chance to organize and share their technology stack with the rest of the community.
LibraryThing - A home for your books.
Makerbook - A directory of the best free resources for creatives
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes