I'm looking for a program/script that allows my visitors to create an account and have their own blog. I've found one that runs off phpBB, but it's not very good, at all. So can someone recommend a good program for this?

I have never used this script but you can take a look:
http://www.bloghoster.net/

I'm actually looking for a free one, guess I should have mentioned that...

lifetype.org (formerly plog) is useful for this. it only use one database and can be setup to host multiple blogs. you need to be able to activate wildcard DNS if you want them to have their own subdomain (like jim.yourdomain.com)

hope this helps

Do you know where I can see a demo?

it listed on the site :)
http://demo.opensourcecms.com/lifetype/

http://demo.opensourcecms.com/lifetype/

i'm not sure if you can see the actual signup process at that address or not so here's a link that will allow you to register a blog like one of your users:
http://demo.opensourcecms.com/lifetype/summary.php

i fooled around with NewLifeBlogger before too and it seemed to work OK:
http://www.sevengraff.com

demo here:
http://www.sevengraff.com/demo/

your welcome:)

kk, thanks for the help, I'll take a look at them and see which I like :D