As a web server for my local dev environment as well as deployment servers.
It is a nice way to quickly prototype applications.
This is my code editor of choice.
Client side programming.
It provides a great API for DOM manipulation, AJAX, and other handy tools.
To make my CSS more efficient, better, and most importantly more fun!
I have the root of my LAMP stack set up as a Dropbox folder so that I can sync my work between all of my dev environments.
This is where I stash my git repos.
I use HipChat to communicate with group members. I like that I can hop on and catch up on any conversations that I missed.