Your Dev Environment
ahlatimer: I have one of the 27" iMacs with a 26.5" external display. I use parallels whenever I need to test sites in IE, and it's very, very useable. I also do a little bit of actual development (IronPython+Silverlight) in the VM as well, and it's the same story. If I keep the VM fullscreen, I really can't tell I'm not working natively. There are the occasional slowdowns (HDD performance, mostly), but I'd imagine switching to a SSD would practically eliminate it for me.