Every litigator should have a working knowledge of the ins and outs of federal multidistrict litigation.
Although at Legal Underground, I've done my best to explain how things work by posting about the MDL panel now and then, my tone over there is a bit too tongue-in-cheek for some. If you want a more meaty, serious introduction to federal multidistrict litigation, take a look at the Thompson West webpage, "Unraveling the Mystery about Multidistrict Litigation."
The Thompson West webpage contains a very good, free interview with David Herr, the author of Multidistrict Litigation Manual. You'll also find a free link to Herr's whitepaper on federal multidistrict litigation. Recommended.