Future versions of the Linux Kernel (such as 3.0) will include support for the Xen hypervisor. This means that Linux distributions will typically offer out of the box support for both hosting Xen and running as a guest operating system under Xen. more>>
Rather than installing a server, such as a web server, directly onto your main computer, why not install it in a VM? This sort of setup has a few advantages of security and convenience. These days, spreading resources out into the cloud is the in-thing, but consolidation is often underexploited. Hosting a server in a virtualizer such as VirtualBox is often a good approach for casual or occasional server needs on a home network.