As mentioned in the release announcement: "Many people have received their 4.6 CDs in the mail by now, and we really don't want them to be without the full package repository. We are pleased to announce the official release of OpenBSD 4.6. This is our 26th release on CD-ROM (and 27th via FTP). We remain proud of OpenBSD's record of more than ten years with only two remote holes in the default install."
I really want news like this on the front page, but sadly, the long list of improvements makes no sense to me - I don't know what's important and what isn't. If someone can provide a nice readable summary of the most important improvements, I'll include it to the item and place it on the front page. There we are.