Bitworks released version 3.3 this week, new features are:
Extra player buttons for wider screens (max 40 players)
Windows 7 compatibility
VO2 Max added to stats screen and adjusts to run speed on custom script files
Compatible with older versions, free for all registered users
It's a bit more than this really, it has a widescreen mode which adjusts automatically.
The software is more popular than ever, have a look at the beeptest pages. http://www.rugbycoach.com/fitness/test/beeptest.htm