PHP Developerment

http://talks.php.net/ > powerpoint slideshows for various PHP topics areas of most interest are
In below order
1 > http://talks.php.net/show/starting_php5
2 > http://talks.php.net/show/php5_intro
3 > http://talks.php.net/show/apmysql

Advanced PHP discussion on security/ debugging/ sql injections
http://talks.php.net/show/korea09

To understand Security issues with PHP
http://talks.php.net/show/nyphp-security
http://talks.php.net/show/vrana-security
http://talks.php.net/show/filter-phpworks7
http://talks.php.net/show/oscon2004-foiling-cross-site-attacks

If PHP Debugging is ever needed please see below resources
http://talks.php.net/show/xdebug-barcelona8
http://talks.php.net/show/xdebug-vancouver7
http://talks.php.net/show/xdebug-tropics5
http://talks.php.net/show/xdebug-phptek7
If you come across PHP documentation/information written by Rasmus Lerdorf you can gurantee its not only good but straight to the point and should be treated as an Authority in PHP.