[ESS] Cheating ESS to recognize maxima as an ESS process

[Stephen Eglen]

as well as Rich's response,
note that Maxima comes with emacs files 

http://maxima.sourceforge.net/faq/faq.html#Emacs0

for doing what you want.

Also, something I've used from time to time is imaxima.el -- it
renders the output in tex and then converts it to an image displayed
within your buffer.  See the screenshot ...

http://www.ifa.au.dk/~harder/imaxima.png

Stephen