Pages tagged percona:

PERCONA PERFORMANCE CONFERENCE 2009 SCHEDULE :: PERCONA
http://conferences.percona.com/percona-performance-conference-2009/schedule.html

These are all mysql oriented, but it sure seems like there are some fantastic principles to be pulling from here. Ex "covering indexes; orders-of-magnitude improvements." Or one on optimizing disk i/o.
Slides from a great variety of sessions @ Percona Performance Conference 2009 (April)
slides of the conference are available onliny