thats the point pretty much exactly.. rooting the droid will eventually lead us to load the custom roms we all know and loved from our winmo days.
it's way too early for that though, becasue there is nothing developed yet.. but now that there is root access, it will allow for some very talented and smart people to start figuring out how to create recovery images and such..
which all will lead us to custom roms !
and endless nights flashing once again...... ah.. can't wait !
for now though, there is no benefit.. other than perhaps actually 'being' rooted, so you are ready... they are already at work patching the current exploit that allows root right now as it is..
EDIT: here is a 'cleaner' link and explanation of the root step by step..
http://areacellphone.com/2009/12/mot...to-root-droid/
the phandroid site thread is just out of control and too ridiculous to follow.