So - you might've read something about overclocking recently.
Essentially what this means is you can get roughly 50% extra performance out of your Pi! It'll allow you to overclock the CPU to up to 1Ghz and while the Pi is cool enough it'll run at this level. If it overheats? Well, they've added a fail safe into the latest Rasbian - it'll fall back to a lower config:
And best of all, it's 100% endorsed by the foundation - you can do this without invalidating your warranty! So - try out the latest distro - you can find it here.