Thanks all, I got my mini 9 this morning and set to try and install OS X.
I had a retail dvd and an external dvd drive but could not get the netbookcd3 installer to load the mac installer. I was however able to get DellEFI installed and working. The dvd I had was 10.5.1 so I upgraded to 10.5.6 and ran the EFI tools and got a working boot. Upgraded to 10.5.8 and it ran fine. Everything seems to be working. (Sleep works fine)
Thanks for all the guides and tips.
Mini 9 | 2gb RAM | 16GB SSD / 8GB SDHC | OS X 10.6.3 Snow Leopard | NBI 0.8.4RC1
Apple TV | 160GB | CrystalHD
iPhone 4
Powermac G5 Tower | 2x 2.0GHZ | 8GB Ram | 160+250 GB HDD | OS X 10.5.8 Leopard | 24" Acer