Personally I really hate it when developers don't add a commit message in subversion.
Here at stackoverflow I am guilty of the same crime. Usually I'm so involved in my answer that I just forget to add an edit summary. What makes things worse is that I edit heavily.
There is no data about edit summaries in the data dump, but a quick look at other answers shows that I'm seemingly no exception.
What do you think? Do you add an edit summary? Is it bad manners to omit it?
Note: I don't want the edit summary feature gone. I just want to gauge the opinion on its usage.