So back to my questions:
So which part of his plan will lower the price of gas in the immediate
future? And how is his plan different from Bush's?

I don't think it's realistic to expect either president to dramatically lower
the price of gas in the immediate future. We need long term policies so that we
aren't held hostage by every little feifdom on the planet with an oil well.

As far as "how does the plan differ from Bush"........

http://www.johnkerry.com/issues/energy/compare.html