Well, I've finished my month on OS/X. It wasn't really a month but rather a couple of weeks here and there. To be honest I didn't really hit too many situations where I felt like I needed Windows. I didn't have good luck with Chicken-of-the-VNC and the Mac version of remote desktop is not nearly as good as on Windows. That being said I love the fact that iCal and Contacts sync with Google.
I'm writing this under Windows 7 but I'm typing it into the web UI. I'll likely hang out in OS/X a bit more as I have some video editing I need to do and iMovie just blows away any free products on Windows.