I'm not an Emacs user, but use it for org-mode, mostly on a Mac.

I tried finding some discussions on this list about what everyone
on this list uses for Emacs.

I have three Emacs builds that I bounce back & forth between:
1) Aquamacs
2) http://atomized.org/wp-content/cocoa-emacs-nightly/ (found on
http://www.emacswiki.org/emacs/EmacsForMacOS#toc10)
3) http://emacsformacosx.com/ (also found on
http://www.emacswiki.org/emacs/EmacsForMacOS#toc10)

Can anyone point me to a thread where org-mode users discuss the version of
Emacs that they use and OS, etc?

Carsten, what version of Emacs do you use?

Thanks,
--Nate