From their site, which you can find here:
"Welcome to the world's largest free law library.
Searching the Web is easy. Why should searching the law be any different? That's why Fastcase has created the Public Library of Law -- to make it easy to find the law online. PLoL is the largest free law library in the world, because we assemble law available for free scattered across many different sites -- all in one place. PLoL is the best starting place to find law on the Web.
What is available on PLoL?
* Cases from the U.S. Supreme Court and Courts of Appeals
* Cases from all 50 states back to 1997
* Federal statutory law and codes from all 50 states
* Regulations, court rules, constitutions, and more."
It's free and worth a look.