Using RSDLite you'll be back at pure stock, and you'll need to root again.
You could instead look at
http://androidforums.com/droid-all-...oid-without-rsd-lite-up-including-frg83d.html to get root on the phone.
The RSDLite program is a back-end interface (for lack of a better description) for the phone, and it wipes everything and installs the image file you provide it - which, using that link is a pure vanilla OOB FroYo for the DROID. No root, not customizations, it's like you just bought the DROID with FroYo on it - needs to be activated and everything.
Another alternative would be to get a Pure vanilla stock Nandroid backup and restore that - my DROID's battery is dead but I could have one up for you in a day - it would be rooted as well, but you'd still need to activate the phone as if it is OOB.
In a nutshell, though, there are only 8 steps, and the first 2 are simply downloading and installing the drivers and RSDLite.
WARNING: if you plan on doing this, be absolutely sure your USB cable works great and that you can safely put the phone down and not accidentally disconnect it while the RSDLite process is working. Any interruption while that process is working could potentially brick your phone. Usually it will not, you'll just need to start the process again - but there is a critical time period, IIRC, where if the disconnect happens early on in the process it can be bricked.
That being said, I've used RSDLite on my phone several times and never bricked it. It's just a matter of being very very careful.