First I updated gcc to 4.1.1 (from 3.4.6), then I rebuilt the system software (emerge -eav system), and now I'm rebuilding all of the software on the box using the new compiler and rebuilt tools. I started the big emerge last night, and currently, Athena is chugging away at 429 of 1223 total packages.
I don't expect that this will cause down-time to any of the services running. In fact, I'm counting on Apache (the webserver software) to be up and running without interruption throughout the whole process, and afterward. I finished typing up the notes to a talk I gave, and I'm planning on hosting the PDF, as well as linking to an mp3 of a related talk that my dad gave earlier that I'm already hosting.
Also, this weekend I'm going to a Bible conference (Hicks Lake) and I suspect that I'll have some photos to put up on the web when I get back. I don't imagine I'll have too much trouble, because all of my software was up to date before I started, so I'm not getting any new versions of anything that might cause compatibility or upgrade configuration issues.