Harry Potter and the Ambiguous Intellectual Property
To judge by this screengrab from the Second Life log-in screen featuring a "Hogwarts" sign (top right corner -- click to embiggen), there's either an official Harry Potter-themed experience in Second Life, or this is a fan-made sim for Harry Potter roleplay, a very popular (and passionate) sub-community in SL. (I've e-mailed Linden Lab for clarification.) In either case, it's provoked some frustration among members of the SL Potter roleplayers:
[Linden Lab] refused us on mentioning "Hogwarts" as a sim name, or even allowed in Second life regardless. They said it was against their Terms of Service to allow the name Hogwarts on any lands, items or titles in Second Life... but they allow the picture with "Hogwarts" on their banner.
On the other hand, maybe the Linden social team just didn't look at the red sign closely enough. Like most virtual worlds with user-generated content, the company is in a frustrating place itself -- knowing that there's a lot of user-made content that might infringe on the rights of IP holders, not wanting to discourage it, while also not wanting to attract nastygrams from IP holders' lawyers. (As happened to Second Life's Dune roleplaying community.) But if you think it's frustrating now, wait until the European Union puts Article 13 into effect.