I stumbled upon memcache-top in the Homebrew Formula repository. It's a neat little Perl application that aggregate stats from a memcached cluster and displays it in a nice little table.
I like to use: memcache-top --servers='server1,server2,server3' --commands --sleep=1
My only qualm is it doesn't display the curr_items stat. So I wrote a little patch for v0.6 that will add an ITEMS column to the table.
Get the patch from the issue I filed.