1)   Free C# School E-book 1.0
A 330 page e-book that takes you from the very basics of programming in C#, explaining object orientated programming techniques along the way, all the way up to using multi-threading and building GUI and database applications. Also covers C#2.0

 2)   libpropc++ (for C++) 1.0
Template library for properties in C++ (used like 'widget.color = "red";). In class Widget use: prop::Property<Widget, Color, &Widget::set_color, &Widget::get_color> color; Binding properties to auto-synchronize their values.