I created a branch "newbranch" from the master, and then pushed back to the origin. I then created a pull request which was accepted and merged into master.
At this point should I delete "newbranch" from my local and re pull from master to begin working on something new?
What is the proper flow, after a branch has been accepted to master?
Update April 2013:
See "Redesigned merge button" and "What do you do with your branch after a pull request on GitHub?":
The branch is now deleted for you

Original answer (February 2013)
The blog post "Tidying up after Pull Requests" is even more explicit:
The only trouble is that we end up with a lot of defunct branches after Pull Requests have been merged or closed.
From time to time, one of us would clear out these branches with a script, but we thought it would be better to take care of this step as part of our regular workflow on GitHub.com.Starting today, after a Pull Request has been merged, you’ll see a button to delete the lingering branch:

The only case when you wouldn't want to delete that branch is:
If the Pull Request was closed without being merged, the button will look a little different to warn you about deleting unmerged commits:

That would avoid any accident, deleting a branch too soon.
When it is merged into master, you can safely delete it.
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