This is truly astonishing to me: a group of students at Elon University has created a multi-day exhibit on Second Life based on my first book, Bad Astronomy. There are videos based on concepts in the book, a planetarium show, and all sorts of bells and whistles. If you are into SL you can get there using this SURL. I myself am a powerless and clueless newbie, so I fumble around a lot, but from what I can tell this is really amazing. It runs through Sunday, so drop by!