On May 15, 2008, VMware quietly announced that VMware Workstation 6.5 Beta 1 Refresh became available for download.

What’s New in VMware Workstation 6.5 Beta 1 Refresh:

• Performance enhancements to VM Record and Replay — Enjoy faster performance with our advanced VM Record and Replay technology. Record your entire VM execution and replay it with instruction-exact precision. A graphical interface lets you browse, add markers to and edit your recording so you can easily monitor and analyze your virtual environment.
  
• Unity for Linux Guests — Enjoy seamless integration of your favorite Linux guest applications with your host. You can launch, access and run guest applications alongside host applications! Unity for Windows Guests is already supported in the previous VMware Workstation 6.5 Beta release.
  
• Easy Install Option for Linux Guests — Save time and simplify Linux guest operating system installations with the Easy Install Option.
  

Visit the VMware Workstation 6.5 Beta Program for detailed information about the new features, register for the beta program, and engage with their engineers.

You'll need to resign up if you haven't signed up since May 14, 2008.