If you already have version 7.0 its definitely worth the upgrade to 7.1.1 since its free to upgrade. There's a definite noticeable increase in speed and everything generally ran much more smoothly too. I was able to comfortably run 2 VM's simultaneously in unity mode over the host OS (although it was acceptably ever so slightly laggy given the base specifications of the machine) even though my system was only equipped with a base P8400 core2duo. VM boot times significantly decreased along with shut down times too.

Switching and moving content between host and VM's have also become a little more seamless allowing you to move things back and forth with no lock ups or it being disabled despite setting it to allow it to.

Click here to get to official words on WMare workstation 7.1.1

Or if VMware fusion is more your bag click here.