Run Any Version of Virtually Any Application on a Single OS without Any Conflict

Thinstall is now VMware ThinApp!
We are pleased to announce that Thinstall has become VMware ThinApp and is now integrated into the VMware family of desktop solutions. ThinApp dramatically improves application packaging and deployment through agentless application virtualization that plugs into existing tools and processes eliminating disruption, conflict and costs throughout the delivery life cycle

http://www.vmware.com/whatsnew/thinstall.html