Hey I've got a Mac-Mini.. but I only have Windows XP installed on it because I prefer the software available.
I was using Ubuntu for a bit too until I just got tired of it (too much messing about for simple things).
I personally think Ubuntu works better as a kinda emergency-boot live CD backup trick for when my main installed system fails (virus, HDD crash etc.)
No issue with the latest Mac operating system though, I just prefer Windows XP's applications and software.
Oh and I detest Vista btw!
