Here are some of the resources I use.

Blog themes this blog use the Canvas theme.

Great books

This are Amazon affiliate links.

Will It Fly? How to Know if Your New Business Idea Has Wings…Before You Take the Leap : This is a great book to assess your idea. It is basically a score card with 44 elements that allow to quickly see if your idea might fly or not.

The New Business Road Test: What entrepreneurs and executives should do before writing a business plan (3rd Edition) : Another great book to assess your idea and see if it is worth pursuing. It propose a system where your assess your idea in  7 domains, from market to your own aspiration as an entrepreneur.