Reference

JABBER DNS SRV (Jabber 2 Doc Project: 5. Common Configuration Tasks)

http://jabberd.jabberstudio.org/2/docs/section05.html#5_7 how to create DNS SRV records for jabber

Java theory and practice: Thread pools and work queues

http://www.ibm.com/developerworks/library/j-jtp0730.html thread pools and how to design server applications

Learn Chinese Characters

http://www.zhongwen.com/ online Chinese characters reference

Database Schema of LiveJournal

http://www.livejournal.com/doc/server/ljp.dbschema.ref.html basically raw schema in html with some comments

Calculating The Size of a Server Room Air Conditioner

http://www.openxtra.co.uk/articles/calculating-heat-load.php how to figure out what HVAC unit you need to cool the servers

NPA NXX Home Page

http://puck.nether.net/npa-nxx/ NPA NXX Lookup tool

Unicode-processing issues in Perl and how to cope with it (ahinea.com)

http://ahinea.com/en/tech/perl-unicode-struggle.html some tips on how to handle UTF8 in perl

Anatomy of the Linux networking stack - IBM, developerworks

http://www.ibm.com/developerworks/linux/library/l-linux-networking-stack/?ca=dgr-lnxw01lnxNetStack very basic description on linux kernel network stack, but contains a list of follow-up literature, so it’s a useful article, even if you are not a beginner

collection refcard on various IT and CS subjects

http://refcards.com/ useful stuff, especially regex ref. cards, Vi shortcards, you name it

Library of Free Data Models from DatabaseAnswers.org

http://www.databaseanswers.org/data_models/index.htm useful data model samples