All the major Mac news sites are reporting that Mac OS X 10.1.5 is available via Software Update, but none of them only MacNN has mentioned that you can skip Software Update entirely and download a combined 10.1.5 update that installs directly over 10.1. I also dug up a chart of available software updates for OS X system software and bundled Apple applications, with lists of prerequisites for each update and links to download locations.
