This is the single most useful site/blog on the web for me. I can't say how many useful things this blog has turned me on to. It's like the electronic Whole Earth Catalog, but what's better is that it uses no paper, and it's daily.
Kevin Kelly, ex-Whole Earth Review editor, founding editor at Wired mag, author, photographer, explorer, runs this operation, with daily reviews of useful stuff.
"Cool tools really work. A cool tool can be any book, gadget, software, video, map, hardware, material, or website that is tried and true. All reviews on this site are written by readers who have actually used the tool and others like it. Items can be either old or new as long as they are wonderful. We only post things we like and ignore the rest. Suggestions for tools much better than what is recommended here are always wanted. Tell us what you love."
Easiest way to get there is to go to kk.org, then click on "Cool Tools" at the left.