No not really. I brought mine so I could take advantage of having two good operating systems on the one machine. I wanted to use Mac OS X for the day to day stuff where speed would be an advantage, and Windows for my work / support stuff and maybe the odd game where Windows has the edge (compatibility reasons mainly).
I'm not actually trying to move away from Windows. I quite like Windows, but on speed and reliability Mac OS X wins hands down. I'm simply moving to Mac OS for the stuff I do day to day and using Windows for the stuff I actually need it for, therefore freeing up resources on my Windows instance and theoretically helping to prevent it getting bogged down with unnecessary crap.
That said, Snow Leopard is ace. I can see myself using it for more and more as I find decent applications to replace the Windows versions I currently use.