FriendFeed API has client-side JSON as well as uthenticated HTTP using a "Remote Key" that is unique to each user.

Also, Python and PHP API libraries here:

http://code.google.com/p/friendfeed-api/

Eclipse version customized for PHP development.

Tool to help binding to C/C++ native libraries from scripting languages (e.g., Python, PHP, Ruby)

Mapple Valley hosting company.

PHP Study Group Wiki

seattlephp/issocool

Teamspeak can handle a group meeting with audio. Free for non-commercial uses.

Quoted: Zend provides PHP programming platform, PHP development & Production tools, and PHP Training & Certification to enable delivery of business-critical applications. Businesses utilizing PHP know Zend as the place to go for PHP expertise and sound technology solutions.

The official online documentation for PHP. The user comments can be verbose - but maybe helpful.

Probably a better book for the PHP study group.

Quoted: 0596006810 - Programming PHP, 2nd Edition - Programming PHP, 2nd Edition, is the authoritative guide to PHP 5 and is filled with the unique knowledge of the creator of PHP (Rasmus Lerdorf) and other PHP experts.