To sort out why you should bother learning more, click around on this site and hear from people who are using these Next Generation Web tools to push the Web to the next level:
Silverlight™ is a cross-browser, cross-platform plug-in for delivering the next generation of .NET based media experiences and rich interactive applications for the Web. Silverlight offers a flexible programming model that supports AJAX, VB, C#, Python, and Ruby, and integrates with existing Web applications. Silverlight supports fast, cost-effective delivery of high-quality video to all major browsers running on Mac OS or Windows.
ASP.net provides extensive web functionality, which can be implemented using a number of computer languages via the Common Language Runtime. Although ASP.NET could potentially be developed in a simple editor such as Notepad, the real effectiveness of using ASP.NET comes through the use of Visual Studio®.
Visual Studio® is an Integrated Development Environment (IDE) that provides syntax coloring, IntelliSense, and debugging.
Expression Studio™ contains a number of interconnected creative tools, including:
A design tool used to create modern, standards-based sites which deliver superior quality on the Web.
An illustration and graphic design tool that lets you build compelling elements for both Web and desktop application user interfaces.
The design tool to create engaging, Web-connected, user experiences for Windows.
An asset management tool to visually catalog and organize all your digital assets for effortless retrieval and presentation.
The professional video encoder tool that offers enhancement, encoding, and publishing of rich video experiences.
Windows Live™ Platform gives you a deeper level of control by offering access to core Windows Live services and data through open, easily accessible APIs. Now you can build applications and mashups (Web apps that combine multiple services within a single, easy-to-use interface) that unite your innovation with the power of Windows Live.