From top gear May 28, 2006 episode. It's mainly a review of the Z4 but they use the Boxster S as the benchmark.
http://coochas.com/porsche/Resources/BoxsterSvsZ4-TopGear.wmv right click, save as.
I will upload other boxster material (as shown in the beginning of this video) as I come across the episodes while watching them. I'm partway through 2004 right now lol...
[edit] Yes this is completly different video from the previous one I posted.