At Nektra we have done a performance comparison of Virtualizing IE6 on W7 in VMWare ThinApp and Symantec Workspace Virtualization.
You can read the full article in our blog: Benchmarking IE6 Virtualization: VMWare ThinApp vs. Symantec Workspace
We use SpyStudio to compare ThinApp and Workspace Virtualization performance. Both Symantec and VMWare highlight the use of application virtualization to run legacy web applications. There is a huge number of mission critical web applications that only run correctly on Internet Explorer 6 and while companies may be able to afford the cost of migrating applications to modern browsers, they cannot afford even a short application interruption. Virtualization allows companies to continue to run their legacy applications while moving to more modern technology.