Using ZeroMQ sockets in your Perl application.
How to add responsive email content into your responsive email design.
Background information on websockets and an example walkthrough building an evented web application with websockets
Using Salt Stack to upgrade an already install RPM.
An example of deploying Perl applications with Fabric and Carton, with slides from a panel talk at pdx-pm.
An example of the troubles setting up open source high availability clusters
Directions for setting up pkgsrc on Debian Squeeze
Directions for setting up pkgsrc on Centos 5.5