If you look at some of the articles on my blog you see that I work a great deal with Virtual hosts on a day to day basis. VM's are by far not a magic bullet in all cases but are great for making the best use of available resources. So far the leader in the game has been VMware with their bare metal hypervisor offering ESX and ESXi. With a really mature easy to use product they have been an industry leader that has been hard to compete with. That is until now.Sun has been working on their new product xVM Server which is also a bare metal hypervisor that will be open source. Using a similar model to VMmware ESXi the hypervisor itself will be open source and free and the more enterprise add on features will be pay for play. Being open source I see this really having the potential to take off for Sun. If you have used VMware ESXi for any production systems you know a lot of the "gotchas" that you run into with ESXi that were engineered in to push users to the paid version. Looking at some of the screen shots on http://xvmserver.org/ it appears that Sun's product will be fully managable from a web page making it more attractive to enviroments that are not windows centric.
You can read more about Sun's xVM server product at the following URL. While it has not yet been "fully" released yet its a very exciting product. http://www.sun.com/software/products/xvmserver/index.xml
While xVM server has not yet been released Virtualbox has. I have been working with it on my Macbook and have been amazed at its speed. It blows the doors off of VMware Fusion and its a free product unlike the $79.99 that VMware wants for their product. You can download it here. http://www.sun.com/software/products/virtualbox/get.jsp
Update: This product was killed right after the Oracle purchase of Sun. More information here. RIP Sun xVM Server.
