Although noboby seems really enthousiastic about it, it's worth noting that Sun has released a new version of their Sun Ray Software: Sun Ray Software 5

As part of the Sun desktop virtualization portfolio, many of the features of Sun Ray Software 5 will also appear in the upcoming release of Sun VDI Software 3.1.

A major benefit for new and existing customers of Sun Ray Software is the new Sun Desktop Access Client. This new software client provides end-users the flexibility to utilize their existing Windows laptops or desktop PCs, as an alternative to Sun Ray thin clients, to easily access data and applications in a centralized virtual desktop environment. With the Sun Desktop Access Client customers now have a simplified, user-friendly means of accessing the Sun Ray infrastructure, which can help to extend the life of current PC assets and reduce the environmental impact of frequent desktop refreshes.

An additional enhancement in Sun Ray Software 5 is improved Adobe Flash performance, which enables customers to experience accelerated Adobe Flash content with synchronized audio and video on Sun Ray thin clients and Sun Desktop Access Client enabled PCs. The new release also includes greater peripheral device support to virtual desktops through USB redirection to Windows, allowing users to deploy a significantly expanded set of USB peripheral devices with Sun Ray technology, including scanners, printers, and more. In addition, Sun Ray Software 5 allows customers to display Windows Server 2008 applications in 32 bit color and includes support for Windows Server 2008 TS Session Broker.

Source: http://www.sun.com/aboutsun/pr/2009-11/sunflash.20091110.1.xml