What is an emulator? An emulator is a piece of software that runs a virtual computer in the screen of your actual computer. Let me give you an example. Say you have a Windows computer but you want to use some 3D modeling software that's only available for Linux. Easily, you can download Linux off the internet (read Windows/Mac/Linux article for more details) and using the emulator, you can have a window dedicated to Linux, and with that program running in it!
If you have a Windows/Linux PC, visit http://www.vmware.com for some really nice emulators for the other system. If you have an Intel version of Mac OS X, try it out! It just might work.
If you have a Mac, then use VMWare Fusion (free while it's still beta!) or Q (http://www.kju-app.org/kju/)
I have moved my blog to Wordpress at theunixgeek.wordpress.com. I will still be checking back periodically on this one as well, though. 19 April 2009