superuser permissions

what is its point?? i open it and get nothing but a blank screen

It allows apps to access Root, meaning they get privileges to do just about anything possible.
The app just lets you manage them (add/remove).
 
Root Explorer
Rom Manager
SetCPU

A lot more. Those are what I use (and Autostart)
 
Also titanium backup. One the few apps that makes changing roms easier.
 

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