In this episode Matt and Jeff talk about how and why you should consider getting involved in side projects. Despite the jovial subtitle, "Getting a little side action," participating in development outside of your normal development routine is beneficial to you as a developer as well as to your employer or clients. They further expand on the topic by talking about non-code-related side projects such as podcasts, discussion groups, or even writing.
They point out one application that's a good starting point if you're not sure where to get involved: the PHP Mentoring Mentor App. You can listen to this latest episode either using the in-page player or by downloading the mp3 directly. If you like what you hear, consider subscribe to their feed too.