If you are really a geek into this kind of thing. You may try the bootcamp way. and use windows application to adjust. Windows have lots of these kind of juice around. But do it at your own risk.

While people says that the gpu inside MBP has been underclocked. i say it's done for a reason. may be to prevent overheat or something.

Well, overclocking is just not for mb yet. at least not what i know of. you may fry it. processor speed only matters when you are doing complex computation, like rendering, calculate constellations, calculate this calculate that. If not, normal usage wont use up both two cores too much and too often.

2Ghz will take care most of the tasks. No worries.