BadBlue - http://badblue.com - is a free web server for Windows that has been especially designed to work with PHP. Its integrated PHP Wizard makes steps you through download and installation of PHP in (literally) seconds.
New version 2.4.2 adds several requested features:
o Remote administration: you can now designate one or more users as "Remote Administrators"; these users can now use the Manage tab from any location. See the Manage, Define Users option for instructions. Remote administrators can control virtual directories, manage users, control access, and do almost anything a local administrator can do.