http://hg.adium.im/adium-1.4/graph
It doesn't really matter that they're in there (hg bisect don't care ;) but you *can* prevent them. Especially when switching around between branches and going back within history, it's really easy to make a commit on top of an old version, or try and do a merge from a crazy revision. Before you do a merge or commit, use the `hg parent` command to check what the parent rev of the current working directory is -- if it doesn't look like tip, run an `hg up`. You can also use `hg parents` see both parents when you're int he process of merging. -Colin
