[firebones]

While these are some great tips, don't focus so much on the mechanics (timing, practice, speaking style, slides) that you fail to spend time on honing, improving and buffing up the actual content, or taking it in a new direction. A compelling and memorable demo or example of your framework in action--perhaps using it some novel or humorous way no one expected, or connecting it to some bigger picture need that the community doesn't yet know that they have--is time well spent.

You want people coming away with bigger ideas and better understanding; that's what will persist long after they have forgotten whether you ran 3 minutes over or had too many "ums".

Don't neglect the mechanics though, but first things first: interesting and compelling content makes up for a lot.