I agree with Seth on this matter, but I wish to point out that according to the GPL that you both have the right to take a body of code [with the original authors express permission] and incorporate it into a compleate new body of work, with a new name. In short, if you can't agree to work together, then agree to work separately i.e. develop your on code under the GPL and distribute it yourself as a new piece of software with a different name and its own policies. You must follow the liscensing procedures, but I believe that it is OK to do this if the original software is GPL.
http://www.gnu.org/copyleft/gpl.html#SEC3 Best wishes to all of you! -- John Foster AdVance-Computing Systems [EMAIL PROTECTED] ICQ# 19460173