Need suggestions: my main dock button

[droidmyme]

I am using a custom launcher GO Launcher EX with a 3 slot dock. On my left slot I have Dialer and on my right slot I have Hide/Show Status Bar.

I need suggestions for my middle slot, the main one. I just cant figure out, what is the uber button, sth that is just so amazing and intuitive, you wonder why you never had it before. Lol.

Any help?

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