From the intro to the site:
Here are my recommendations for cool stuff. I include any books, tools, software, videos, maps, gadgets, hardware, websites, or gear that are extraordinarily handy or useful for individual and small groups. The best items are those that open up new possibilities. I depend on friends and readers to suggest things. Generally I try something out first if I can. I only recommend things I like and I ignore the rest. Tell me what you love. Suggestions for tools better than what I recommend always welcomed.
If you loved the Whole Earth Catalogs, or the Whole Earth Review, it's a feed worth watching.