Having owned a 2004 Boxster S and a brand new 2011 Boxster S I can say the new one is definitely better bcus:
40 more bhp and more torque. more fun to drive. great road feel.
the 6 speed is smoother, better. a true joy. best stick ever.
the digital speedo is much better located as are all the readout. the dash is much improved.
Lots more toys-
Computer standard
tire pressure monitor
xenon lights that turn
ventillated seats
power seats with memory
Sports Exhaust awesome.
Navigation has altitude feature. great in the mountains.
bluetooth
XM radio built in rather than an add-on
the LED lights look good
self-dimming mirrors
rain sensitive wipers
only downside is no spare
all this for $7k more in 10 years. Not bad.
Life is good.