I think this is a good read for newer members or people who are looking for information on TM law, because it demonstrates that there are various forms of TMs. Like it mentioned, there are TMs where only a specific drawing or image is TMed and does not garuantee exclusivity of the terms contained within that TM. I am sure there are some books that go over the fundamentals of intellectual property and the basic structure of TM law in layman's terms for anyone looking for further information. Alot of it is just common sense though. I've got a pretty good grasp on it and I've never read any books, just used some common sense and noted the different descriptions of TM types within the TM database.
This case definitely shows that it's extremely difficult to claim exclusive right to a term that is widely used and generic in nature. That's why it is always best to register generic domain names and not take the chance of infringing on someone else's established TM. But this doesn't always happen, especially in cases where popular products are released. I.e. Ipod, Wii, etc...