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Since the topic of making movies has been raised, I have to chip in.

Most graphics programs can create a sequence of frames that, when combined 
together, show a rotating object. However, the procedure of combining these 
frames into a movie is problematic for people who are not aware of the 
ridiculously fast and free program called "mencoder", which is a part of 
MPlayer. Mencoder runs in linux, windows and osx:

http://www.mplayerhq.hu/homepage/design7/news.html

Here is a command line that takes all PNG files in a directory and puts them 
together into an AVI file:
mencoder "mf://*.png" -mf fps=25 -o output.avi -ovc lavc -lavcopts 
vcodec=msmpeg4:vbitrate=9000

the important and variable switches used: 
fps - frames per second
vcodec=msmpeg - Microsoft MPEG-4 codec (playable with "Windows-native" codec 
on all windows machines, as opposed to vcodec=mpeg, which is a DivX codec and 
requires installation of DivX)
vbitrate=9000 (9 kB per sec - high quality movie, can be increased or 
decreased)

If you decide to install the entire MPlayer package, the resulting movie can 
be played using mplayer. 

Petr

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