Massimo Re Ferre' has compiled a great comparison of various desktop brokers for VDI.

Client Consolidation is a concept aimed at simplifying desktop deployments removing as much logic (i.e. software) as possible from the end-user's desk. Ideally Client Consolidation deployments leverages thin clients in order to keep remote hardware and software maintenance to a minimum.

The article goes through an overview of the landscape and then lists comparisons of

• Citrix Desktop Server
• VMware VDM
• Leostream CB
• Dunes VD-O
• Propero WorkSpace
• Provision Networks VAS
• SUN Desktop Virtualiz.
• ChipPC Xcalibur Global
• 2X products framework

You can see it here .