Upgrade of three websites to WordPress 2.3.2

I have now upgraded three more websites to WordPress 2.3.2, so they are all done now. This time I made no mistakes in the sequence of work, so each upgrade went fairly quickly—but in each case I forgot (despite my notes) at least one tweak until I noticed that the site wasn't displaying quite right and realised that I had forgotten to activate a plug-in or replace a file in the theme or do something equally trivial.