Update: I’ve replaced the link at the bottom of this page, which originally contained search results from Microsoft’s support site, with a Knowledge Base article that has permalinks to all monthly security releases in ISO format.
Microsoft has been doing this since the beginning of this year, apparently, but this is the first time I’ve noticed it. Security patches for August 2006 are now available as Bulk Updates in ISO-9660 CD image format. The files can be burned onto blank CDs, used on multiple machines, and archived.
This is good news for people who prefer to do updates manually. No more downloading a dozen or so individual patch files and then saving each one. Just make sure you get the right CD image(s). One is for Windows 2000 and Windows Server 2003; another is for Windows XP; and a third is for IE.
If you want to go back and get earlier releases, try this page, which lists all updates in ISO image format since January 2006.