If you use Memcached and WordPress you may find this little plugin handy. Version 0.1 of wp-memcached-manager allows you to test your connection to a Memcached server, see some basic Memcached server stats and perform a cache flush. There is also a very rudimentary tool to see some of the cached data stored, however, it is super basic and not massively useful. In future releases you will be able to walk through data and perform updates on specific keys etc.
Plugin home: http://warwickp.com/projects/wp-memcached-manager/
On WordPress.org repository: http://wordpress.org/extend/plugins/wp-memcached-manager/