Yes, I do. Courtesy of Parallels 5.0 and the installation was relatively easy once I had worked out which version of Windows I really needed (hint, read the box and decide what you will never use). The Coherence Mode is interesting in that you can literally switch from Snow Leopard to Windows 7 with a click of the mouse.
Why bother with Windoze? Well, there are those programs that Microsoft has chosen not to port to OS X, such as Project. And there are still software designers out there who honestly think that the Mac OS isn't important. Example? IKEA - but at least they are honest enough to admit the shortfall.