This is very cool site that covers a world of gadgets and tools and many are free.

Lifehacker, an award-winning daily blog that features tips, shortcuts, and downloads that help you get things done smarter and more efficiently. Lifehacker launched in January 2005, and now ranks as one of the top-linked blogs on the internet according to Technorati. Since its inception, Lifehacker has been named Best Blog by Wired, won several Bloggies, and found its way onto many best-of lists by the likes of TIME, Slate, and many more. Lifehacker’s also been mentioned in The New York Times, Wall Street Journal, O, The Oprah Magazine and PC Magazine as well as other mainstream press outlets.