Shall I re-take GMAT?

Thanks for all of your response. I don't have any reserach experience or published papers. Are they required for application? I think I need to study more about the application process. From reading this board it seems that I missed a lot of important application information.

My stats are:

3.9 GPA in Econ from a small chinese college
3.4 GPA from a second tiered US B-school (I didn't study too much during MBA, since I found that MBA was not my cup of tea soon after I started MBA program. Plus I never planned to go back to school again after MBA)

9 years working experience (5.5 years of audit, 3 years of controllership)

US citizen

I am thinking to go back to school because I want to learn new things and have a flexible work schedule since I have a very young kid to take care of.

I am still hesitating whether to apply for 2011 academic year. It seems that I am well underprepared for the application. What you guys do in order to enhance application? Did most of you actually conduct research or publish paper? But without proper guidance, how (I assume most of you have a master degree at the most) you guys can manage to do reserch on your own or have a paper published? I assume before entering a PHD program, most of the students are blind on reaserch metholodgy.