Thinstall sold
Well, it was only matter of time... Thinstall was bought by VMWare - http://vmware.com/company/news/releases/thinstall.html.
I really like Thinstall - it is agentless based application virtualization, easiest way to describe it is to think about it as AutoIt - runtime is included in single-exe "installation".
To check how it works, just visit http://www.thindownload.com/ and try it yourself.