Changes made.

If you visit a "day" archive for either a Saturday or Sunday, or the Today page and there are no posts it will advise I am now not usually posting at weekends:

(Ignore the first date, it's from a test page)

@colinwalker I like the idea of explaining why there is not a post on that day, but the Sorry feels a little out of place. It makes it seem that readers are owed a post and that you are letting them down by not having one.