I have a MBP early 2008 and ever since I learned about the 4 finger gestures, i learned about this program called
multiclutch jIf that link doesn't work, try this:
Everytime I Think About You I Multitouch My Cell « Will Henderson The second link definitely works.
You can really customize it to work "globally" and individually in other programs individually ie... word, firefox and safari for example, they're the programs i use the most... maybe transmission and even what ever you run, it's great! But you're only limited to 3 fingers
you set it to global like 3 fingers up for all windows, down for spaces(or clear screen), or left to clear screen instead and it works all the time no matter what you're running.
then for firefox you set forward, backwards and then the "global settings take over. you can also set zoom in/out, reload, what ever there is a commad-key combination to set something to.
Quick thing I learned was that you should ahem donate (click on it once and reopen it)... and click and see what that's about. Then you can enter the commands easily using the right command button. But before you set anything in multiclutch go to spaces or whatever and empty out the key you want to use (for global) and it won't do the actual function. Then go back and reset the command key to F8 for space F9 for all windows/programs, F10 for desktop... F11 for what ever, you get the idea.
This is defintiely something that has made my MBP alot "easier" to use, getting to spaces is just 3 fingers down, all windows is 3 fingers up, clear destsktop (when not in browser) . And when you're in a browser it does the back, fwd, zoom etc... and up/down work like normal, you just lose the 3 finger left or right function while in a browser... which i think is great anyway... Hope this helps some of you get the most of the multi-touch program and your touchpad.. One draw back is you need to leave system preferences loaded all the time so i just added that preference pane to load on startup and stay hidden.