Sharing Rules of Thumb
One of the key properties of open endeavours is winnowing down and sharing of essential information so that others can build on it. Here's a site that seems to be a distant cousin:
A hundred years ago, people used rules of thumb to make up for a lack of facts. Modern day rule of thumbing is rooted in an overabundance of facts. The average person, confronted with the Internet’s oceans of data and multiple overlapping Ph.D. dissertations, often is as perplexed as a pioneer chemist trying to whip up a little gunpowder without a formula. A pilot in a tight spot doesn't ask questions about aeronautical engineering; a pilot in a tight spot asks "now what?" There are times when you don't need to know the best way to do something. These are times for ballpark figures, for knowing what you probably can get away with.
Surprisingly addictive. (Via Joho the Blog.)