This is Patentable? Reuters reports that "Netflix may face tough fight in Blockbuster patent suit." From the article:

Netflix on Tuesday sued Blockbuster in federal court in San Francisco, seeking an injunction to stop Blockbuster from infringing on two patents that protect Netflix's business method.

The patents cover Netflix's practice of having subscribers prioritize 'queues,' or lists of titles they want to rent, on Netflix's Web site, and of automatically replacing each DVD that is returned for the next title on the subscriber's queue.