>
> > Unfortunately, the new latex/beamer exporter does not seem to check that
> > the user may have wanted to put his/her
> > own label on a frame and it adds its own label to the user defined one.
> > It is not that difficult to patch org-e-beamer--format-frame to avoid
> > adding label when the user provides its own, but is it
> > the right thing to do ?
>
> Considering the remark above, I'm don't think that's the best way to
> handle the problem. On the other hand, "label" is an option and should
> be treated as such (that is, an user should be able to provide its own
> value for it). It is implemented now.
>

Well, thanks for this It solves an easy case that has already asked for in
the past.
Now I can do :

* section
** My frame title                     :B_frame:
:PROPERTIES:
:BEAMER_opt: label=tcs
:BEAMER_env: frame
:END:

Some text. Some text.  Some text. Some text.
Some text. Some text.  Some text. Some text.

* section                                     :B_ignoreheading:
#+BEAMER: \againframe<2>{tcs}

** Following frame
etc.

Not as clean as we might want it, but it is working ok. I had to add an
"invisible" section
else the againframe is not exported between frames, but inside the
preceding frame.

I don't think it was possible before.
I think it may prove useful to be able to chose the label for the frame.

-- 
Fabrice