How to create new head on commit?

How can I easily get rid of the other head, without messing up my working directory?

Merge the branches with hg merge.

Is there a problem with keeping mercurial repositories in dropbox folders?

This seems redundant to me, since Dropbox keeps a 30-day history on your files. I'd choose either Hg+Bitbucket (or whatever Mercurial hosting) or Dropbox, but not both.

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Edit: Why not use Mercurial and Dropbox? Here's why.

Ben Hughes said it well:

By keeping your Mercurial repo on Dropbox you’re version controlling your version control system files. If you somehow manage to cause a conflict with files in your .hg directory, things could get messy. Recoverable, but messy.

I disagree with @Matt Ball on the dropbox matter.

I think redundancy is your friend. Also the purpose of Hg and the dropbox is slightly different in your case.

Dropbox backs up for you automatically (as well as tracking file changes and letting you work on any machine with internet and making it easy to share your work.) and Hg lets you work offline and commit in logical chunks (as well as working as backup when you sync).

I have used Hg in my dropbox folder without problem for at least a year and I have not experienced any problems.

If you work on more than one machine and have the dropbox/Hg combo on all machines I suggest that you let dropbox do the syncing.