From Neat New Stuff comes this lead to Rules of Thumb. There is a Lawyer category but not a Librarian one. Most of these Rules of Thumb are kind of silly, but legal researchers sometimes need the darndest things. Most interesting to me is the design of the web site, which is not bad at all for this sort of information.
From their About This Site:
“The goal of this website is to gather every rule of thumb on earth into one gargantuan, easily searchable online reference database that will be accessible from anywhere in the world and continue to grow forever.”