Finally installed Snow Leopard after having Tiger for 3 years. installation was pretty easy, just had to format old Tiger instalation and install snow leopard on blank space. Running better than expected on a mac mini 1.8ghz, although was a bit worried at first as it was really slow just after installation, but speed gradually inproved after more use. Exploring folders from the dock in grid view is great, fast and efficient.
Managed to install Windows 7 RTM too, via bootcamp. Runs well, although installing the drivers from the Snow Leopard disc seemed to make windows a bit slower.
Kinda dissapointed with Front Row, the interface is a bit pants now compared to the old Tiger one.
Overall its been a good upgrade from Tiger and it only cost £22.99 from amazon.