Yes, with this oneclickroot, you can also choose to unroot:
Pete's Motorola Root Tools
EDIT: I just unrooted because I started suddenly experiencing freeze-ups which required a battery pull each time. Unroot button fails unless you choose "temporary root" first and then click unroot.
I rooted, and wanted to verify unrooting would work. I had to slide the unlock between boots also for the unrooting. Now I can't get the phone to be rooted again, I keep getting an error at step 3 of 3.