Small thing this: when you change a tag on a bug, the email notification from Launchpad describes it as removing the original tag and adding a new tag.
That makes sense but something slightly irritating was that Launchpad would order the email like this:
Tags added: qa-needstesting
Tags removed: qa-untestable
The reverse order always seemed more sensible to me: i.e. first show the tags that were removed and then show the tags that were added.