The upgrade went fairly smoothly, and I think this website is operating normally. If you seen anything different or wrong, please let me know in the comments.
A few backend issues still need to be dealt with. For some reason, the comment admin screen is not displaying comments. If I search for them, they appear, but when I click the Show All Comments I get a "No results found" message. Odd. And, I'm having trouble with the ftp settings. Which should be fairly straight-forward, so I'll keep trying.
Beyond these issues, I'm also still getting used to the new look and design of the admin interface. I'd heard it was very different (and not necessarily better), so I was prepared. Even with accounting for bias, I do think I like the old version better, but we'll see.
The upgrade itself went smoothly. WordPress makes is pretty easy, with their upgrade instructions. It really was as easy as the directions indicate, despite me making a few mistakes along the way (hurray for backups).
However, I must say that it was not as easy as upgrading my library's blog. Our website is hosted at Bluehost.com, which offers many web services and programs pre-installed through Fantastico. I know Fantastico has some issue, but it sure does make upgrades like this easier. What took me a few hours to do on my own for swissarmylibrarian.net took perhaps ten minutes through Bluehost (and I didn't see the problem with comments and ftp settings).
I don't want make a sales pitch for them, but if a library is looking for a place to host their website, we've been very happy. It's cheap (something like $7 a month), their tech support has been great, and so much software comes preinstalled that it's easy to manage and try out new web tools without having to do all the installations yourself.