I am new to this so couldn't really grasp what Joel and Jeff were talking about in one of their recent Stack Overflow podcasts. I recall Joel referring to Visual Studio doing all sorts of things with the OS and IIS and then he thought using a virtual machine may be a good solution. To this Jeff said yes but then they discussed the impact of such a machine on memory and performance.
Could some help me here and explain this. Also, if we do want to use a virtual machine, how can we setup one on Windows 7 (once it's out).