Writing for the Wall Street Journal, Walt Mossberg favorably compares Mac OS X 10.5 Leopard to Microsoft’s Vista operating system. For current Mac users, however, he says the upgrade isn’t a “must have,” calling it evolutionary rather than revolutionary. From what I’ve seen of the Leopard’s features (and I’ve only seen what’s publicly available), I can’t disagree, and I also can’t speak to what the “under-the-hood” features might mean for the future. It seems to me, though, that there’s a lot of anticipation over this release — even more than for Tiger.