Nicstat, Solaris network utilization.
How I managed to miss nicstat, written by Brendan Gregg, I don’t know. Brendan seems to come up with all sorts of really neat tools and is the author behind the DTrace toolkit. Nicstat is written through the kstat interface, but my guess is that it could be updated to use DTrace if you wanted to do so. In any event, having a vmstat/iostat/mpstat-esque tool for looking at your network cards? Awesome. Thanks Brendan.