Magic Startup Shell - Validate your startup idea by asking the Magic Startup Shell
Requests for Startups - A place to discover ideas that VCs & angels want to fund
Talk to Customer - Validate your idea with potential customers in 3 steps
Twittr Gems - Discover and read the best Twitter threads
Idea Validator - A customer development tool to help you validate your ideas before building them.
Entrepreneur List - A curated library of entrepreneurship knowledge to help entrepreneurs grow a business.