http://www.vmware.com/products/player/
That's a free Virtual Machine player.  You can download (free) virtual machines to play with.  This is so cool....
So... anyone running the full-blown VMWare workstation app could creat a virtual machine running any software/OS they wanted and then give it to other people to play with/use.

I downloaded the Browser Appliance and it's 285MB zipped and 962MB out of the archive - you're getting a computer, an OS and software so these things would be large files - put into an archive to keep all the files together.  If you think 962MB is huge... my Vista VM is nearly 8GB and sucks up around 750MB of RAM once it gets going.  My XP VM is 4.3GB.  Their Browser Applience VM runs Ubuntu and looks like it takes about 256MB of RAM once it's running.
http://videosean.gotgeeks.com/i/WinVista-VM/BrowserAppliance.jpg &lt;- theres a screenshot

At any rate after downloading one of these virtual machine archives, you'd then just extract the archive to wherever you have enough space for it, start the player open the virtual machine by going to the directory you extracted to.

Why would anyone want to do things this way?  It's just one of those things... if you have to ask, then you don't understand ;)  Oh yeah... one more reason to get into Virtual Machine stuff is because Microsoft doesn't want you to.

http://slashdot.org/article.pl?sid=06/11/24/0835208&amp;from=rss  -  Virtualization Disallowed For Vista Home