If you are an OS X geek, I highly recommend you keep an eye on Ken Bereskin’s weblog. You can learn all sorts of useful stuff from this fellow, who just happens to be the Product Manager for OS X., like the fact that v.10.1.3 was put up on the servers for download yesterday afternoon.
I knew about the update last night because when I booted my iBook into OSX to play Black and White (Be good. Be evil. Be a god.), it asked. Software Update is cool that way.
One of my favorite sources to get OSX specific news is http://osx.macnn.com.