And remastersys TWICE caused major problems with my system (Ubuntu) because it changes BUT DOES NOT CORRECTLY RESTORE the uid. I still haven't fully recovered, and I think you should note this somewhere before other users ruin their systems with the program. I know how to recover.
It's noted that there's no waranty for published tutorials. The author somehow managed to get things working but You or anyone else doesn't have to. When trying to do something You take full responsibility for Your system.
I've made two great images of Ubuntu 7.10 and 8.04 prepared just the way I need and like using Remastersys and I'm very happy I could find such usefull tutorials here.