Craig is right that GNOME is still a way away from OS X for polish, integration and intuitivity, but it's nice that they have their sights aimed in those directions and development is going pretty fast these days - it definitely helps to have Novell bankrolling a lot of the work (hopefully they will be beefing up the Ximian/Linux division development teams a lot). It's not all as simple as catching Windows/OSX up though, everyone is trading features - Windows's next generation of interfaces are going to be bristling with shiny innovations lifted from OSX and open source apps, I bet ;-)