diff --git a/free-programming-books.md b/free-programming-books.md
index bafa2caafeefa570c7cea709caaa0676f8a9ac81..c92ed0b79f212204d212ea995ef1cf692810ca18 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -18,7 +18,6 @@
 * [DTrace](#dtrace)
 * [DB2](#db2)
 * [Delphi / Pascal](#delphi--pascal)
-* [Django](#django)
 * [Elasticsearch](#elasticsearch)
 * [Emacs](#emacs)
 * [Erlang](#erlang)
@@ -62,6 +61,7 @@
 * [Prolog](#prolog)
 * [PostgreSQL](#postgresql)
 * [Python](#python)
+    * [Django](#django)
 * [R](#r)
 * [Racket](#racket)
 * [Ruby](#ruby)
@@ -183,9 +183,7 @@
 ####Software Architecture
 
 * [Seamless Object-Oriented Software Architecture](http://www.bon-method.com/book_print_a4.pdf)
-* [Summary of the GoF Design Patterns](http://domaindrivendesign.org/sites/default/files/discussion/PatternSummariesUnderCreativeCommons.doc)
 * [How to write Unmaintainable Code](http://mindprod.com/jgloss/unmain.html)
-* [OO Design](http://homepage.mac.com/s_lott/books/oodesign.html)
 * [Object-Oriented Reengineering Patterns](http://scg.unibe.ch/download/oorp/)
 * [Patterns and Practices: Application Architecture Guide 2.0](http://www.codeplex.com/AppArchGuide)
 * [The Definitive Guide to Building Code Quality](http://nexus.realtimepublishers.com/dgbcq.php)
@@ -261,6 +259,8 @@
 * [Object-Oriented Reengineering Patterns](http://win.ua.ac.be/~sdemey/) - Serge Demeyer, Stéphane Ducasse and Oscar Nierstrasz
 * [High-Performance Scientific Computing](http://bit.ly/hpc12) (class lectures and slides)
 
+####Web Performance
+* [Book of Speed](http://www.bookofspeed.com/index.html) by Stoyan Stefanov
 
 ####MOOC
 * [MIT OCW](http://ocw.mit.edu/OcwWeb/web/home/home/index.htm)
@@ -374,12 +374,6 @@
 * [Essential Pascal Version 1 and 2](http://www.marcocantu.com/epascal/)
 
 
-###Django
-
-* [Djen of Django](http://agiliq.com/books/djenofdjango/)
-* [Django by Example](http://www.lightbird.net/dbe/)
-
-
 ###Elasticsearch
 
 * [Exploring Elasticsearch](http://exploringelasticsearch.com/)
@@ -598,7 +592,6 @@
 * [Entity Framework](http://weblogs.asp.net/zeeshanhirani/archive/2008/12/05/my-christmas-present-to-the-entity-framework-community.aspx)
 * [Moving to Microsoft Visual Studio 2010](http://blogs.msdn.com/b/microsoft_press/archive/2010/09/13/free-ebook-moving-to-microsoft-visual-studio-2010.aspx)
 * [Nemerle](http://asaha.com/ebook/AMTQ2NjA-/Nemerle.pdf)
-* [Programmer's Heaven C# School Book](http://www.programmersheaven.com/2/CSharpBook) (covers C# 1.0 and 2.0)
 * [Threading in C#](http://www.albahari.com/threading/)
 * [Visual Basic Essentials](http://www.techotopia.com/index.php/Visual_Basic_Essentials)
 * [Visual Studio Tips and Tricks](http://www.infoq.com/minibooks/vsnettt) (VS 2003-2005 only)
@@ -713,7 +706,6 @@
 * [Logic, Programming and Prolog (2ed)](http://www.ida.liu.se/~ulfni/lpp/)
 * [Natural Language Processing in Prolog](http://www.informatics.susx.ac.uk/research/groups/nlp/gazdar/nlp-in-prolog/index.html)
 * [Natural Language Processing Techniques in Prolog](http://cs.union.edu/~striegnk/courses/nlp-with-prolog/html/)
-* [Prolog Programming A First Course](http://computing.unn.ac.uk/staff/cgpb4/prologbook/)
 * [Prolog Techniques](http://bookboon.com/int/student/it/prolog-techniques-applications-of-prolog)
 * [Simply Logical](http://www.cs.bris.ac.uk/~flach/SimplyLogical.html)
 * [Visual Prolog 7.2 for Tyros](http://download.pdc.dk/vip/72/books/tyros/tyros72.pdf)
@@ -745,6 +737,11 @@
 * [Snake Wrangling For Kids](http://www.briggs.net.nz/snake-wrangling-for-kids.html)
 * [Think Python](http://www.greenteapress.com/thinkpython/) - Allen B. Downey
 
+####Django
+
+* [Djen of Django](http://agiliq.com/books/djenofdjango/)
+* [Django by Example](http://www.lightbird.net/dbe/)
+
 
 ###R