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One of the great new features of Mac OS X Leopard is spaces. Spaces lets users customize virtual desktops and allows for switching between them as needed. Spaces helps users keep their applications, files and projects organized so that switching between projects is as simple as clicking your mouse.

1. Visit your Expose and Spaces pane in the System Preferences configuration tool.
2. Check "Enable Spaces."
3. Decide how many spaces you need. Consider adding a space for each of your specific projects or functions. Spaces can be used for work, entertainment, communication or anything else for which you might need to group specific application. You can customize up to 16 spaces.
4. Add rows and columns until you have set up as many spaces as you need.
5. Select keys on your keyboard to control each space with a single stroke.
6. Assign applications to each space. You may permanently assign programs to one space or to all spaces. Likewise, not all programs require assignment and if left as is, can be accessed from each space.
7. Group like applications into a specific space. Remember that many major applications are designed to take up the entire display screen; limit how many of these applications go into each space when grouping.
8. Press F8 on your keyboard or access Expose to display a virtual map of all your designed spaces.
9. Move from space to space by using your mouse to click on the space that's running the applications that you are interested in using.

The F8 is register by itunes, so we can use middle key of mouse
and i use middleclick soft to make the trackpad enable middle click with triple tap.
download address: http://clement.beffa.org/labs/projects/middleclick/