OK, the font we used in the header for "ecomodder" is: Neuropol
I really don't have any giant logo files. But people who want can feel free to work from these:
And there's this cleaned up, larger image that piwoslaw made for another thread:
http://ecomodder.com/imgs/em_logo_better_green.fig
Have fun. Post a thread with pics if you make anything custom/unique!