There should be enough here to persuade you that you can probably find somebody better than me.
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Rapid Web Services integration with Rails (Slides)
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MySQL Replication slides from BarCamp Belfast 2010 (Slides)
(very old now, we’re now using Galera Clustering, I helped author the percona-galera cookbook discussed here.)
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WRR DNS with PowerDNS
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Nagios/Icinga (Slides)
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stack-kicker (Slides / Video)
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Consumerism V Craft: (Slides / Video)