http://www.newmediacampaigns.com/page/map-and-reduce-implemented-in-php
http://commonphp.blogspot.com/ (from a Hacker News discussion about the first link above: http://news.ycombinator.com/item?id=782370)

http://aymanh.com/how-debug-bash-scripts

http://en.oreilly.com/oscon2009/public/schedule/detail/7955
http://oreilly.com/catalog/9780596102357/preview.html
http://www.slideshare.net/coogle/top-30-scalability-mistakes#
http://en.oreilly.com/mysql2008/public/schedule/detail/625

http://jimbojw.com/wiki/index.php?title=Understanding_Hbase_and_BigTable
http://blog.rapleaf.com/dev/?p=26
http://stackoverflow.com/questions/375194/how-to-design-hbase-schema

Some Hadoop links I had bookmarked:

http://project-voldemort.com/blog/2009/06/building-a-1-tb-data-cycle-at-linkedin-with-hadoop-and-project-voldemort/
http://wiki.apache.org/hadoop/PoweredBy
http://www.scaleunlimited.com/events/scale_camp
http://mysqlha.blogspot.com/2007/10/hadoop-and-mysql.html
http://www.unquietdesperation.com/2008/09/19/announcing-the-los-angeles-hadoop-meetup/

ZooKeeper (part of Hadoop but doesn't appear to require it?)
http://wiki.apache.org/hadoop/ZooKeeper
http://highscalability.com/zookeeper-reliable-scalable-distributed-coordination-system>

Proper (and Improper) Usage of Memcached
http://joped.com/2009/03/a-rant-about-proper-memcache-usage/

While the above says don't use memcached for sessions, others have other ideas--are they wrong?
http://phpslacker.com/2009/03/02/php-session-clustering-with-memcache/
http://highscalability.com/strategy-how-manage-sessions-using-memcached
http://www.softwareprojects.com/resources/programming/t-memcached-for-php-sessions-1654.html

This might be what's needed if you want to do sessions, etc. w/memcached--patches for memcached which add replication:
http://repcached.lab.klab.org/

Some other memcached links:
http://terrychay.com/blog/article/keeping-memcache-consistent.shtml
http://code.google.com/p/memcached/wiki/FAQ#How_does_memcached_handle_failover?

Memcached and MySQL:
http://highscalability.com/bunch-great-strategies-using-memcached-and-mysql-better-together
http://tangent.org/586/Memcached_Functions_for_MySQL.html

http://jailer.sourceforge.net/
http://jailer.sourceforge.net/exporting-data.htm

http://www.programmerfish.com/10-free-apps-that-turn-your-ubuntu-into-video-studio/

http://www.rawseo.com/news/2009/05/13/how-to-turn-a-php-script-to-an-exefor-free/

http://sebastians-pamphlets.com/the-anatomy-of-http-redirects-301-302-307/

http://blog.procasts.co.uk/2009/03/choosing-your-screencast-software/

Includes web-based services, Linux app, etc.

http://dreamcss.blogspot.com/2009/04/145-new-quick-cheat-sheets-for-some-of.html

Includes everything from Google to Photoshop to PHP, Ruby, JQuery, etc.

http://brian.brispace.net/2009/04/09/php-on-google-app-engine/

There's a link around the end of the comments to a sample app too.

http://www.smashingmagazine.com/2009/04/03/8-handy-tweaks-to-make-gimp-replace-photoshop/

http://www.wikivs.com/wiki/MySQL_vs_PostgreSQL
http://wiki.postgresql.org/wiki/Why_PostgreSQL_Instead_of_MySQL_2009