Nice little self-contained perl script that shows a basic memcached top display for a list of servers.
$ curl http://memcache-top.googlecode.com/files/memcache-top-v0.6 >
~/bin/memcache-top
$ chmod +x ~/bin/memcache-top
$ memcache-top --sleep 1 --instances memcache1,memcache2,memcache3
That gives you this:

Nifty.