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[threefive]

Happens all the time at the engineering conferences I attend. My two collaborators and I will typically present very similar talks at three different conferences. The spin is usually more towards each individual's particular specialty, but the meat is basically the same. Sometimes in the two or so months between conferences, we'll have new results. Of course, we don't know that will be the case when the abstracts are written.

[slac_barbarian]

I would withdraw the paper from all but the top conference.

Chime.  Conferences are time and money consuming.  This ain't the Buffalo Bill traveling show.

[l1norm]

If you are working in a multidisciplinary area of research, it is pretty common to tailor the same results to specific audience' interest. I do not see any problem with that. But if you are presenting the same exact content multiple times, you are just wasting your time.