Roleplaying Potter at Hogwarts
I couldn't find any more, so I went into Second Life to see if I could find Harry Potter and found the Hogwart Project Group. They've build several important decorums from the Potter series in Second Life (Two sims: Sunset Harbor and Phoenix Estates).
This first snapshot is of the Wizard's Alley:The second snapshot is the Hogwarts school of Magic, and at the right bottom the Quidditch arena:
A virtual world like Second Life is extremely suitable to do things which are not possible in Real Life, like playing Quidditch. I'd suggested this to a friend of mine a little over a year ago. He was very doubtfull. Off course, there are tons of Potter fans out there who'd love roleplaying the series. However, he was weary of copyright issues. The Potter series have been such a smashing success that it would probably be very hard to get Rowling's blessing to recreate the series in Second Life.
This build is certainly not an official build, but a very great hobby project. I don't think they've considered copyrights, but it's fun while its there.