What is your development environment? Do you have a local web server and database running on your laptop? Do you SSH into a remote server? Vagrant is a tool built using technology like VirtualBox and Chef to create a lightweight, reproducible, and portable development environment. Your entire team can work on identical systems locally, without stepping on each others toes. You're going to like the way you code. I guarantee it. :-)
Andrew Shell has been a professional PHP developer since 2003 and is currently CTO at Pinpoint Software. Occasionally, he blogs at http://blog.andrewshell.org/
After the Talk:
Join us for some extra networking time and some friendly conversation. We'll choose a social location (likely some place with food and drinks) that is nearby, and we'll all head over after the talk.