Occasionally I commit some code to the repository, add a comment/summary, then read the summary back and realise I've made a mistake or should have included a bit more information. It is possible to edit the summary after a commit in TortoiseHg? I'm using version 1.1
If that is the last commit, you can press "Undo" button in the commit dialog (it is an interface to hg rollback) and then commit the same files again with a new message. If this is a commit in a middle of the tree, you need to use mq extension to delete all later commits and reapply them. And if the commit with an incorrect summary is pushed to a public repo, you should accept and live with that, because you should not change published commits.