I have the following
WAMPSERVER
Wampserver installs the 3 technologies (Apache, MYSQL, PHP) which provide you with PHP development environment
I also have a 'Just Nice' Drupal install which i clone off. It took a bit of work to get Drupal just nice in order to quickly deliver websites fast with CMS functionality.
I have a menagerie of browsers...
Multiple IE's
http://tredosoft.com/Multiple_IE
Firefox
Chrome
Safari
IE8
*** Other apps ***
Photoshop
Dreamweaver
Notepad++
Eclipse
VStudio 2008
EMS MYSQL Manager