Am currently listening to Ron Cundiff's webcast (#3 of 22!) on Visual Basic .NET: Class Libraries. 
This is a Microsoft Office Live Meeting (free training). This is a 200-level 1 hour lecture. Might be a bit below me, but it's always good to "fill the gaps." 

I'm going to ask the following question: "I have been a VB programmer for years, and recently bowed to peer pressure and created my first C# app. What's the fuss about? Why is C# seen as something special? I couldn't find any extra features to give C# its reputation as a more robust programming language."
(Private Answer: nah, it's mostly because of the c/c++ programmers, and it's the most commonly used language in college...)
- Demo - Go to http://msdn2.microsoft.com/en-us/netframework for free downloads.  
- .NET Framework 3.0 is now available.  
- The Software Development Kit (SDK) is necessary to create .NET applications.  
- You must install the Framework first.  
- The SDK comes with QuickStart Tutorials. 
- The CLR Debugger is the heart of the .NET Framework. This is what runs your apps.  
- The System namespace has a manifest (observable from the IL DASM) which references multiple external assemblies. 
 
- Namespaces - a way to have a unique library name 
- Separated by "." notation
 
- System namespace - is the top-level namespace 
- contains all base objects 
- data types
 
- Other System.* Namespaces - Divided by functional area 
- System.Web 
- System.Windows 
- System.Data 
- System.Xml 
- System.Configuration
 
- My Namespace - New in Microsoft(R) Visual Basic(R) 2005 
- Speed-dial into commonly used functions (e.g. My.Computer.Clock = Microsoft.VisualBasic.Devices.Clock) 
- Reduces the amount of code you have to write 
- Discoverable through IntelliSense(R) 
- Reduces the amount time spent researching base classes or application programming interfaces (APIs)
 
- Custom Class Libraries - User-defined namespaces 
- Contain functions 
- Add references 
- "Imports" statement 
- Are used just like System.* classes
 
- Session Summary - Assemblies 
- Namespaces 
- System namespace 
- Other system.* namespaces 
- Custom class libraries