Source Code and Descriptions about Hiding Messages in

• Images and AVI-Videos
1. Introduction
2. Multiple Carrier Files
3. Invisible Changes
4. AVI Files
5. Regions with different Data Density
6. Indexed Bitmaps like GIF or PNG
• .NET Assemblies
1. How and Where to Hide Data
2. Using Key Files and more Methods
• Audio Data
1. MIDI Files
2. Wave Audio Files
3. Music Tapes
• Collections in General
1. For Beginners: GIF Palettes, HTML Attributes, Shopping Lists...
2. Advanced Sorting: Full Efficiency in Shopping List and GPS
3. For Musicians: Sorting Notes to Melodies
• ZIP Archives

The Complete Solution

• SteganoDotNet - A Steganography Framework for .NET/mono 

The latest Presentations

• Sorted Lists at the Labor in Bochum
• SteganoDotNet at the Labor in Bochum

These articles have been published first on , there you can find discussion forums for each one.
Here are the german translations and a few corrections.