The latest "Meet the MySQL Experts" Podcast is now available. This month we talk with Mark Leith about the MySQL Performance Schema.
Additional Reference Urls:
A MySQL Replication Load Average with Performance Schema
Monitoring Processes with Performance Schema in MySQL 5.6
New ps_helper pages
Helper Functions for ps_helper
MySQL Performance Schema Statement Digests
From MySQL Connect Improving Performance with the MySQL Performance Schema by Jesper Krogh - Senior MySQL Support Engineer, Oracle
I also had a recent blog post that touched on Show processlist and Performance Shema.