To do most things on the N900, you will need to have root access for your device. Unlike other devices on the market, you need not do anything fancy or risky to your phone. Just run the built-in Application Manager and install an application called "rootsh".
Once the application is installed, just go to terminal shell (I run the built-in application called "X Terminal") and type:
You will notice the prompt changes from a "$" (user access) to a "#" (root access). You now have the power to make the device great or to break it.