Justia: Relatively new to the legal Web scene, Justia deserves mention for several reasons. It stands alone in offering a free keyword-searchable database of federal district court filings. You will find court opinions from 2004 to present as well as other filings. (See also: Free Case Law Databases)
Other offerings worthy of special mention include a database of federal appellate court opinions, RSS feeds for monitoring civil court filings by the type of lawsuit (Select any available topic and go to the bottom of the page to find the feeds.), RSS feeds for tracking federal regulations, and a blog search engine for law-related blogs.