AdminClient.pm found under 'contrib' in cvs (http://svn.apache.org/viewvc/trafficserver/traffic/trunk/contrib/) has a couple of issues.
1) there's no pod or perl documentation
2) there's no MakeFile to help with placing AdminClient.pm in the proper directory so @INC will find it.
3) the package statement is flawed as it's not in a Apache/TS/ directory structure. To use the current AdminClient.pm, one would need to modify the 'package' statement by hand.
I have a local copy where the above issues are fixed, but have questions about the v2 stats on port 8091. Specifically, will future stats use port 8091 (or whatever proxy.config.stat_collector.port is set to) or will stats continue to be read from the 'unix domain socket' which currently defaults to /usr/local/var/trafficserver/cli. If someone who knows can update this ticket, I can make those additions/changes before committing to SVN.