Five Great Reasons to Root Your Android Phone - Android rooting - Lifehacker
Android Hacking For The Masses - Android - Gizmodo
Speed Up and Back Up Your Rooted Android Phone - Android rooting - Lifehacker
If you've rooted your Android phone with a custom ROM, you've already got a snappier OS. With a few free apps, you can free up memory for even better performance and keep your ROM up to the bleeding edge.
Moving your applications to your phone's SD card, referred to as "apps2sd" in geekier circles, is said to "free up memory,"Worst. Bug. Ever. | Ed Burnette’s Dev Connection | ZDNet.com
(This is old, just saving it for later.)
execute *every* SMS as root... so handy
"when the phone booted it started up a command shell as root and sent every keystroke you ever typed on the keyboard from then on to that shell."
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interesting gphone bug
Don't tell me they thought of that as being a feature...The Start to Finish Guide to Rooting Your Android Phone
Guide to root the Motorola Droid