sbSettings is a must have jailbreak app and it allows you to show dBm for both Cellular and WiFi in the menu bar and allows you to turn on and off features from any screen and even the lock screen too.
Lockinfo is like Intelliscreen but you can also set it up to be on the home screen and a pull down from within almost any app and it is cheaper too.
Both are working with IOS 4 with the exception of the Twitter plug-in for Lockinfo.
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