WorldTradeLaw.net- This link opens in a new window
Provides, among other things, documents that are called "Dispute Settlement Commentaries" or DSCs that summarize the Panel and Appellate Body reports, along with some editorial comment. They can greatly reduce the time needed to understand the rulings of either the Panel or AB (for ex. a DSC for a 3,000+ page case was only 1,000 pages, or so.)