I have always been a huge fan of VMWare Workstation. "The basic idea is that it lets you run a whole PC inside a window, with its own operating system and hard drive."
I've dreamed of the day when I could use something similar for servers. VMWare has had a couple of server products for a while now, GSX and ESX, but they were expensive and complicated.
You’re reading Joel on Software, stuffed with years and years of completely raving mad articles about software development, managing software teams, designing user interfaces, running successful software companies, and rubber duckies.