Thanks Viv. No need to rush into getting an iMac - Apple is years ahead of MS in terms of product design and quality and I can't see MS catching up with Vista in the near future
To be honest, I'm guessing that underneath, 10.5 is basically just a bit of an evolution of 10.4, which for me was very stable and reliable.
Looking at the 3D reflective dock with the icons sitting on it, its like they are sitting on a tray right in front of me for real, and you now get a subtle dot of light underneath them to show the currently running applications. The whole thing is bloody marvellous