I've had nothing but Windows machines since birth but both of my laptops recently stopped working so I had to get another laptop. I got a MacBook Air and I absolutely love it. I won't be purchasing another Windows PC again.
I've installed Windows XP in a Paralels virtual machine. To be honest, I use my virtual machine a lot less than I thought I would when I made the switch last July. To maximize application efficiency, some applications are better run in native mode (handbrake). I've run Windows Media Encoder which is an extreme CPU hog in virtual machine mode. Took little longer, but still worked.
As Mikey from the Life cereal commercials would say, Try it, you'll like it.