Everything went fine with the upgrade, after all I’ve done it before. One thing was a little funny, the URLs had little minus twos in them (-2) instead of the categories I’d filed the articles under. Looking at the database, I found the data in the wp_terms table, and no names. The upgrade had blown away some data. I searched the interwebs and found a good article by David Cumps to fix the missing categories.

Hopefully all the categories are correct. I guess I should go look through all incoming links and make sure they still work, someday.