I recently discovered this (very long) pdf by one of my favorite novelists, Neal Stephenson. If you enjoy the content of the article as much as I did, you might also check out the links on Wikipedia regarding revisions, etc.
I've been collecting quotes for a long time - on napkins and scraps of paper and, more recently, by texting them to myself for later filing. Some of my favorites are compiled here. If you have one worth sharing, send it along - I might even add it to the list.