I keep meaning to visit Neat New Stuff on the Net more often. Along with its sister site Ex Libris, Neat New Stuff on the Net is targeted largely at "librarians and information junkies" but tries to appeal to a wide audience. From the page describing "how I find neat new stuff":
"From a range of noncommercial sites with substantial content, I always pick a couple of fun sites, several sites of serious reference value, and a few sites that meet ordinary human needs. Lest I fall into the trap of tailoring a collection to my own personal interests, I always try to make sure there's something there for people who are NOT like me -- children, men, dog-lovers, businessmen, stay-at-home moms, people of other cultures and religions."
Anyhow, among this week's picks is a site called What's That Stuff?. If you ever wonder what went into Cheez Whiz or silly putty (no, the ingredients are not the same), this is the place to go.