VB.NET
Most of the VB.NET code was written in Visual Studio 2003. For some reason, MS has made the various versions of Visual Studio.NET somewhat incompatible; the project code may or may not load into the version of Visual Studio that you have. I've seen incompatibility between Visual Studio.NET and .NET 2003, between .NET 2005 and the beta versions, and so forth. You would think that they could at least keep compatibility on their own products. So much for xml bringing compatibility to file formats.VB.NET Code
Source code for VB.NET, including sample applications. The code is clean and well-documented, with examples for MP3 Tagging, Common File & Folder functions, ZLib Compression, Common Dialogs, and a whole lot more.
Visual Basic 5 and 6
Source code for Visual Basic 5 and 6, including sample applications. The code is clean and well-documented, with examples for MP3 Tagging, Common System, File & Folder functions, and Common Dialogs. But wait! There's more!.
Delphi and Pascal
Source code for Delphi and Pascal, including sample applications. The code is clean and well-documented, with examples for Disk and File Functions, a screen saver with example code, and a uniform random number generator, as well as more more code and examples.
Cross Platform
Although I've been a Unix and Linux system administrator, I haven't had occasion to write much code for those platforms. Some notable exceptions would be specialized shell scripts and some lightweight perl that is certainly useless to anyone else. Usually I've found that whatever I need is available, and for free, from the open source community. One exception was when I needed a PHP script to display multiple random images. I had to write that one myself, and so it's available here in case anyone else can use it. Feel free to appropriate and mangle the code as you see fit.