Use VM to Play Old DOS Games

Do you have some old DOS games that no longer play on your system? I found a way to resurrect these old classics and play them again. As you may recall a while back, I introduced the VM Player as a way to run Firefox in an effort to provide total protection on the Internet. You can use this same idea to run DOS. I have found three solutions:

1. Download Microsoft's Virtual PC and load FreeDOS or another DOS. (Virtual PCs only provide the hardware visualization, you still need to provide the OS.)
2. Use the VM Player and run the Nostalgia appliance. This appliance comes pre-installed with OpenDOS and 8 old DOS games.
   
3. Use the VM Player and run the FreeDOS appliance (beta).
   

On a related note, apparently there are some hacks you can make to the VM Player environment to create new environments without purchasing the client.