I would not be opposed to deleting the whole Demo/sgi tree.
OK, I've done this. I've saved a private copy of the mclock code for nostalgic purposes; I may yet rewrite using Tkinter. :-)
I don't have an SGI workstation anymore, but I did have an SGI O2 until recently. I think the audio (and al) stuff and the gl stuff probably still work (I used mclock until recently). I think we can definitely get rid of the video directory (CMIF video format, remember that?). I'm not sure whether sv still compiles on modern SGI's. The cd module also still works.
Having said this, I'm not sure there is still much value in keeping the demos. The modules in the Modules directory is another matter. Until recently I have used cd and al. I think cl might still work, but I'm not sure. I don't think sv works on anything other than Indigo's with a Starter Video board. gl (and I think also fm) still works. sgi also still works, but I'm not sure how useful it still is. It just defines functions nap and _getpty. rgbimg is for reading SGI RGB images, but is portable. Although one must ask whether it has a place in the standard library, since there is no similar level of support for more popular image formats.
OK, I won't touch the SGI specific code in Lib and Modules. --Guido van Rossum (home page: http://www.python.org/~guido/)