PACER: Public Access to Court Electronic Records (if you have money to pay).
What is there to say about PACER? It's horridly inefficient, with each court maintaining its own servers. It has an ancient user interface, straight out of the 1980s. And it costs $0.10 per page, which doesn't sound like a big deal, at least until you run a docket search on a big class action case and accidently run up $3.00 in charges with little to no warning.
In short, it sucks. And many people, myself included, think court records should be open and free. PACER, at least for now, won't be, as it's a cash cow for the courts, but third-party solutions exist that will help you to cut down on your bill while archiving copies of the documents for public (and free) consumption.