Hi, I will try to write complete reference about step by step Joomla 1.5 programming. Hope it will be usefull for you.

Chapter 1 Joomla! Instalation
1.1 Apache, MySQL, and PHP Package Installation
1.2 Joomla Database Preparation
1.3 Joomla! Installation

Chapter 2 Once Over Joomla!
2.1 Joomla Front End
2.1.1 Joomla Menu
2.1.2 Joomla Content
2.1.3 Joomla Adverstising
2.1.4 Joomla Functions
2.1.5 Joomla Decorative Elements
2.2 Joomla Back End

Chapter 3 Joomla! Modification
3.1 Back End Structure
3.2 Menu Site
3.2.1 Control Panel
3.2.2 User Management
3.2.3 Media Manager
3.2.4 Global Configuration
3.3 Menu Menus
3.3.1 Menu Manager
3.3.2 Main Menu
3.3.3 Trash Manager
3.3.4 Make New Menu
3.4 Content Menu
3.4.1 Article Manager
3.4.2 Making New Article
3.4.3 Section Manager
3.4.4 Category Manager
3.4.5 Front Page Manager
3.4.6 Trash Manager
3.5 Tools
3.5.1 Write Message
3.5.2 Read Messages
3.5.3 Mass Mail

Chapter 4 The Components and The Extensions Menu
4.1 Components Menu
4.1.1 Banner
4.1.2 Contacts
4.1.3 News Feeds
4.1.4 Polls
4.1.5 Web Links
4.2 Extensions Menu
4.2.1 Install/Uninstall
4.2.2 Module Manager
4.2.3 Plugin Manager
4.2.4 Template Manager
4.2.5 Language Manager
4.3 Installing Extensions Exercises
4.3.1 The Component Package Installation
4.3.2 Template Installation
4.3.3 Language Installation

Chapter 5 Understanding Joomla! Extension
5.1 Is It Can Be Developed?
5.2 Understanding Component
5.3 The Module Understanding
5.4 Understanding Plugin
5.5 Conclusion

Chapter 6 Hello, Jogja!
6.1 My First Component
6.2 Executed the Component
6.3 Reading Parameter
6.4 Separating Ouput and Logic
6.4.1 Understanding the Output and the Logic Separation
6.4.2 Implementation at Joomla!
6.5 Component Registration
6.6 Register to Main Menu

Chapter 7 The Important Provisions
7.1 Object and Classes
7.2 Hello Jogja Class
7.3 Constructor and Initializing Object
7.4 Inheritance
7.5 Work in Joomla!

Chapter 8 Component
8.1 Front End Component
8.2 Back End Component
8.3 Registration into Database
8.4 Make the Link Front End
8.5 Make Toolbar
8.6 The Available Toolbar Icon
8.7 Make the Database Table
8.8 The Making of Class Table
8.9 Make Form Input Back End
8.10 Save the Data into Database
8.11 Making List Screen
8.12 Advance List Screen
8.13 Editing Data
8.14 Deleting Data
8.15 Change the Publication Status
8.16 Publish the Data in Front End
8.17 Publish the Single Data
8.18 Make the Friendly Link
8.19 Make the Comment Table
8.20 Make the Table Class for Comment
8.21 Make the Comment Form
8.22 Input the Comment Data
8.23 Publish the Comment
8.24 Summary

Chapter 9 Modules
9.1 Database Registration
9.2 Publishing the Module in Front End
9.3 Publishing the Data from Database
9.4 Publishing the Text after Link
9.5 Using Helper
9.6 Using Template for Flexibility
9.7 Template Alternative
9.8 Publish the Comment Number
9.9 Summary

Chapter 10 View Controller Model
10.1 How to Implement in Joomla
10.2 The Ways of MVC Working in Joomla
10.3 Book.php as the First Door
10.4 Make Controller
10.5 Make Model to Publish All of the Data
10.6 Make View to Publish All of the Data
10.7 Make the Default Template
10.8 Make Model to Publish the Single Data
10.9 Make View for the Single Data
10.10 Make Template for the Single Data
10.11 Summary

Chapter 11 MVC Back End
11.1 First Door
11.2 Controller and Model
11.3 View
11.4 Pagination
11.5 Input Data
11.6 Saving Data
11.7 Editing Data
11.8 Deleting Data
11.9 Publish State

Chapter 12 Plugin
12.1 Register to Database
12.2 Make a Simple Plugin
12.3 Event Plugin

Chapter 13 Configuration Settings
13.1 Parameter for Modul
13.2 Parameter for Plugin
13.3 Parameter for Component
13.4 Parameter Type

Chapter 14 Packaging
14.1 Make File List
14.1.1 Packaging Module
14.1.2 Packaging Plugins
14.2 Component Packaging
14.3 Insert the SQL File
14.4 Make Back End Menu Items
14.5 Extra Installation Scritps
14.6 Distribution

Chapter 15 Fast Track to Template
15.1 Understanding the Template Basis
15.2 Code and Position
15.3 My First Template
15.4 Activating Template
15.5 Desinging Layout
15.6 Using jdoc
15.7 Using Parameter
15.8 Put the Text in
15.9 Preview Thumbnail

Related posts:

1. 1.2 Joomla Database Preparation
2. 1.3 Joomla! Installation
3. 3.3.2 Joomla Main Menu
4. 2.1 Joomla Front End
5. Make your own Joomla Template: Part 4 (Activate Template)