Not new to the dance, the perennial wallflower, virtual desktop, is now showing up on people's dance card.  As administrators and managers realize the benefits of server virtualization, virtual desktop is coming to the forefront of the virtual discussion.  Centralized management of the desktop has clear advantages, but until recently desktop virtualization had pitfalls that made it untenable for most shops.  The open source SPICE protocol looks to change the playing field. Late last year,