My root apps:
Adfree - blocks ads across the entire phone
Widgetlocker - fully customizable lock screen
Titanium backup - can backup a clone copy of your phone to your SD card, so if you get a new phone or anything (or factory reset your current one cause you brick it all the time experimenting with roms), you can bring all your settings, apps, and data with you easily.
Really, because of titanium backup, I dont see why anyone is apprehensive about experimenting with weird software on their phone.
Really I don't understand why people are afraid to root their phones either *shrug*
Headset button control - HUGELY useful for in-line button controls on headphones, for sports or any time you need to control your phone without looking at it
Es file manager - one-stop file browsing. FTP, LAN samba shares, root browsing, etc etc.
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