I just finished adding pseudo-color plots to matplotlib in the CVS
repository.
Here are a couple of screenshots
http://nitace.bsd.uchicago.edu:8080/files/share/pcolor_demo_large.png
http://nitace.bsd.uchicago.edu:8080/files/share/mri_with_eeg_large.png
The scripts that generated them are in examples/pcolor_demo.py and
examples/mri_with_eeg.png.
There is currently bug with pcolor in the GTK backend can cause a
vertical banding to appear due to integer rounding in very small
pcolor plots (eg, when you place the plot in a small subplot). The GD
and PS backends work fine however.
Enjoy!
John Hunter