Improve README

README.md

@@ -4,6 +4,8 @@ The PL/0 Language Tools serve as an example of how to construct a
 compiler. The language 'PL/0' was originally introduced in the book
 "Algorithms + Data Structures = Programs", by Niklaus Wirth in 1975.
 
+![Overview](Overview.png)
+
 This project includes a full stack of tools designed for educational
 purposes to learn about compilers, interpreters and virtual machines.
 Each component can be executed independently and is typically between
@@ -13,18 +15,6 @@ It is designed to be clear and concise at the expense of performance. It
 is easy to extend and modify, e.g. adding new syntax constructs or
 machine instructions.
 
-## Updates
-
-This branch of development adds several new compiler targets. I'm interested
-in the possibility of cross compiling PL/0 to other languages; most of my work
-on this targets this.
-
-The primary target at this point is [Parable](http://forthworks.com/parable),
-which is a stack oriented, concatenative language.
-
-It will eventually have target compilers for Retro and ANS FORTH as well.
-Other target compilers may be added in the future.
-
 ## Installation
 
 Install ply:
@@ -70,9 +60,15 @@ If you want to see a abstract syntax tree of your program, use the pl0_graphviz.
 
 A sample graph is included in the `examples` directory.
 
-For more advanced usage, including documentation on individual components, please see the [online documentation][2].
+For more advanced usage, including documentation on individual components, please see the [online documentation](http://programming.dojo.net.nz/study/pl0-language-tools/index).
+
+## Cross Compiling
+
+Recent development adds several new compiler targets. I'm interested in the possibility of cross compiling PL/0 to other languages; most of my work on this targets this.
+
+The primary target at this point is [Parable](http://forthworks.com/parable), which is a stack oriented, concatenative language.
 
-[2]: http://www.oriontransfer.co.nz/learn/pl0-language-tools
+It will eventually have target compilers for Retro and ANS FORTH as well. Other target compilers may be added in the future.
 
 ## License