Another, put to me by a friend who is an English teacher, is that, though reading is primarily a visual experience it should appeal to all the senses. Sound comes easy - all these 'He saids' littering the text - and some visual description seems to come as a natural requisite to most people when they write, but he reckons the other senses get neglected. He encourages people to get smell, taste, and feel in there too.
I haven't exactly made myself run a checklist every time I finish something - but it's a tempting idea.