[StealingDreams]

I agree that it would depend on what feild you were in and what kind of job you were applying for. If it is sales where they want to see your real world results of producing and only care that you have a degree and don't even care what it is in, then yes only put the most relivant or inpressive one. If they see you have a ton of education they just might wonder if you are spending more time studying than you are out there in the field selling stuff and you never want that.
If it is teaching, corporate training, the scientific industry, or in some cases government work you just might want to put everything on there because they often consider people with more education more valuable and they pay to reflect that. Having a Masters or PhD will put you in a higher pay range unlike positions where your pay is based on meeting sales goals and projected numbers.
I guess the best advice would be: Know your audience. Have different versions of your resume for different situations and apply accordingly. I personally have 3 different versions that I use depending on what I am applying for.