I know alot of people use phpnuke because it's very easy to set up and install. I've used it before and well it had its ups and downs .
But one day I was looking for a better CMS similiar to it. Well I found United-Nuke. You can use everything you can use for phpnuke (themes, blocks, modules, hacks). But you can also use most phpbb2 hacks. The default theme is pretty horrible looking but it's not hard to find a decent phpnuke theme. I would list everything but would take to long . So I'll just give you a link .

www.united-nuke.openland.cz

Note: This didn't start in english so that's why the domain is so weird. Also it's not very popular with english people since it doesn't seem to be well known.

Ok, very interesting. I myself don't use a content managements system because I like to be able to code my own sites so them i can customise it more easily. I have tried to use php nuke before but i didn't like it. It was hard for me to use and just not what i needed. Anyway this new content management system you found seems to be better than php nuke. Basically you page it's the same, but with phpbb hacks you can use. What exactly do you mean?

Well I would love to code my own site just don't have the time or the knowledge . But with phpbb hacks I mean. Well you can use mods on phpbb.com too. Your not limited to just the ones that have been ported for nuke