I'm a little behind the times and just picked up a copy of Snow Leopard from the Apple Store. I upgraded from 10.5.x to 10.6.3 (the copy included in the box) without any problems. I've run software update several times to upgrade to 10.6.6, but each time I get an error message early in the update process. The files download, but the error occurs less than five minutes into the install process. It doesn't say anything specific, simply that an error has occurred and that I should run software update again. Any ideas? It's not a huge deal at the moment, but I'll eventually need to update the software. Thanks~!