Eric Kintz, the vice president of global marketing strategy and excellence for HP, is running a very critical blog entry about second life. Taglein: Top 10 reasons as why I still need to be convinced about marketing on Second Life.
While he raises right points there, there's one point missing: this is going to be the next big thing[tm], if done right, the start of something new in that kind of matter, if done right, so getting experiences in SL will help you adapt later to other virtual worlds more easily.