In many of the Sun videos about ZFS I see them using some kind of graphing program to show the read write IO of the disks.
See them red and green bars?
What is that program and is it in OpenSolaris?
There's a ZFS web based interface, but it doesn't provide any analytical insight into system. What you're probably seeing up there in the demo is DTrace data being plotted in real time. You could even do that on your own with a dtrace and gnuplot script.
This application is likely based on kernel statistics retrieved through the kstat interface.
Have a look at iobar for a similar tool.