More resources

Now, googlin' for "Open Source ERP" I found...

Other systems ranking high
Tiny ERP
http://tinyerp.com/
which has a nice website

opentaps
http://www.opentaps.org/
Which seems to be a layer over OfBiz

JFire
https://www.jfire.org/
Looks pretty nice

OpenMFG
http://www.openmfg.com/
Looks ok

And other cool links
I actually saw this link in the wikipedia ERP page:
http://www.cio.com/research/erp/edit/erpbasics.html
I'll check it out when I get the time. It looks interesting

Too bad I didn't get any results from google sets (I had higher hopes for this google project):
http://labs.google.com/sets

This is a pretty good article (although it seems a little like pro-'CK-ERP'):
http://www.webpronews.com/expertarticles/expertarticles/wpn-62-20060111OpenSourceERPforSMEs.html
Where 'Fisterra' and 'CK-ERP' are mentioned (and subsequently added to my research list)

A list of (presumably java) open source ERP projects:
http://www.java-source.net/open-source/erp-crm