SBSettings- lets you swipe the top left corner for a drop-down HUD to toggle settings such as WiFi, Location, 3G, Airplane Mode, Brightness, Bluetooth, Push mail, etc. Also displays your current IP addresses (for cell data and wifi) and lets you 'dock' applications, taking them off the Springboard.
The app is free, and after upgrading and re-jailbreaking, one of the 3 JB apps I installed (the others being BiteSMS and MyWi).
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