Just noticed the .NET 3.5 framework contains classes for emitting Atom and RSS for you. Presumably the emitted content validates.

Quoted: Represents a top-level feed object, <feed> in Atom 1.0 and <rss> in RSS 2.0.

Url routing without MVC.

Quoted: Although the new routing capabilities were developed for the MVC framework, they've been factored out and are now shared with Dynamic Data and, of course, you can use them in your own ASP.NET applications as well.

Here is an MSDN article on the ASP.NET MVC framework from March.

Quoted: ... a controller can be instantiated directly, and action methods called, without any additional infrastructure. You don't need an HTTP context, and you don't need a server, just a test harness.
...
the ASP.NET MVC Framework offers Web developers a new way to build Web applications in the Microsoft .NET Framework. The Framework is designed for testability, embraces HTTP instead of trying to abstract it away, and is extensible at just about every point.

Refaving Derek. Visual Studio will ship with jQuery. Neat.

Quoted: I'm excited today to announce that Microsoft will be shipping jQuery with Visual Studio going forward. We will distribute the jQuery JavaScript library as-is, and will not be forking or changing the source from the main jQuery branch. The files will continue to use and ship under the existing jQuery MIT license.

var in c#

Quoted: Variables that are declared at method scope can have an implicit type var. An implicitly typed local variable is strongly typed just as if you had declared the type yourself, but the compiler determines the type.
...
// Example #2: var is required because
// the select clause specifies an anonymous type
...
var custQuery = from cust in customers
where cust.City == "Phoenix"
select new { cust.Name, cust.Phone };
...
// var must be used because each item
// in the sequence is an anonymous type
foreach (var item in custQuery)
{
Console.WriteLine("Name={0}, Phone={1}", item.Name, item.Phone);
}

New .NET Facebook API on CodePlex.

Quoted: Recent changes to the Facebook API are being evaluated and a Toolkit update will be released at the end of this week as a point release (version 1.7). We are planning to address the changes to the platform that specifically cover the new user profile design and session changes to many of the existing methods.

Quoted: Facebook.NET provides a .net library for use in developing Facebook applications and accessing Facebook APIs. The library primarily geared around and optimized for developing ASP.NET-based ...

Quoted: I've been playing with Facebook for a few days and am impressed. This post shares some thoughts as well as introduces a new open source project, Facebook.NET, a framework optimized for developing ASP.NET-based Facebook applications in C# or VB.NET.

Quoted: ·Many of the language enhancements (which will be found in VB 9 and C# 3.0) are the foundation of these more prominent new technologies.
...
Automatic Property setters/getters
· Object Initializers
· Collection Initializers
· Extension Methods
· Implicitly Typed Variable
· Anonymous Types