It's a decent read, and very true about "living dangerously", as I currently have XP, OS/X, DOS (6 and 7) and others all virtualized and running. I run them on a separate subnet, away from my daily system and block them explicitly from accessing the internet.

I do it purely for enjoyment, as I appreciate the retro "operating systems" as they are truly technical compared today's modern desktop environments which run and look like a SmartTV OS. Also building memories of my form glory days of running BBSes, like RemoteAccess and others that don't have a modern day rebuilds or reimagines.