Like a lot of Mac users, I find myself using a Windows box at work. My law firm has invested a lot of money into our network and some Windows specific software (not to mention years of data) which means I am often stuck on a windows machine. That doesn't mean you have to leave the OS X experience at home though. There are some good Windows applications that Aquafy the Windows user interface. Now granted these don't give you the full OS X experience, they do at least make things a little nicer. Kind of like giving a Yugo a new shiny red paint job with flames on the side.
Anyway, I actually licensed one called Stardock before I even bought my Mac. That was one of the things that pushed me over the edge. I figured if I was emulating a Mac, why didn't I just buy one? Now that I spend so much time in OS X, (I generally work on my laptop in the office these days) it is nice to have all the buttons in the same places when I do find myself working on the PC. I recently discovered another way to Aquafy your PC with FlyaKite OSX. This is free but I haven't tried it on my work PC yet. I'm much less adventurous with that machine. If anyone does give it a try, drop me a note and we'll get a post up.
I've already decided that when the office machine dies, I'm going to put an iMac in there and run my windows programs through parallels or boot camp if necessary, but for the time being, these applications will have to do.