Tansferring users between systems

I have two machines, one is the old firewall/mail/dns etc and one is a
new one with new hardware and a new OS install (the old one was RH6.2
patched to within an inch of it's life so it's a bit beyond upgrading).

How can I easily transfer users and passwords across? Home directory
content isn't a problem but I will need new ones created with correct
permissions. It's mainly passwords I don't want to have all users redo
if possible. I'm toying with a simple script to pull the usernames, gids
etc out of the passwd file and the passwords from the shadow file and
running them though I would have though this would be a relatively
common operation.

Can't seem to google anything and surely someone here has done this
before.

Thanks
CH
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