Walt Mossberg of WSJ gives a mini-review of Mac OS X Snow Leopard and leaves a little tip for Tiger users.

For owners of Intel-based Macs who are still using the older Tiger version of the Mac OS, Apple is officially making Snow Leopard available only in a “boxed set” that includes other software and costs $169. The reasoning is that these folks never paid the $129 back in 2007 to upgrade to Leopard. But here’s a tip: Apple concedes that the $29 Snow Leopard upgrade will work properly on these Tiger-equipped Macs, so you can save the extra $140.

That’s a nice treat. Thank you, Apple.