Is today "Release Day" or something? So many new releases...
Let's begin with IronPython, which reached status 1.0:
IronPython 1.0 has been released to the .NET community and is available on CodePlex. IronPython is an implementation of the Python dynamic programming language. IronPython is built on top of the .NET Framework and is interoperable with other .NET languages. Binaries, source code, and tutorials are available at CodePlex.
Click here to download IronPython at CodePlex.
Another release is Expression Web Beta 1:
We are pleased to present the Beta 1 release of Expression Web (formerly Expression Web Designer).
Expression Web is a professional design tool that helps you create and work with:
- Standards-based Web sites
- Sophisticated CSS-based layouts
- Extensive CSS formatting and management
- Rich data presentation
- Powerful ASP.NET 2.0-based technology
To download, go here.
Still going strong 
Next is WCF, which reached RC1 also.
The release candidate 1 for the .NET Framework 3.0 is now available! You can download the components for the RC1 here:
More info on RC1.
The Interactive Designer got updated, and now the September CTP is available:
Microsoft® Expression® Interactive Designer September 2006 Community Technology Preview (CTP) is a professional design tool used to create engaging, rich user interfaces for desktop and Web applications.
To download, go here.
To finish, this one isn't actually released as of yet, but it's an interesting project being researched at MS:
Microsoft researchers are experimenting with an automatic code zapper for the company's Internet Explorer Web browser.
Researchers at the Redmond, Wash., company have completed work on a prototype framework called BrowserShield that promises to allow IE to intercept and remove, on the fly, malicious code hidden on Web pages, instead showing users safe equivalents of those pages.
The BrowserShield project—the brainchild of Helen Wang, a project leader in Microsoft Research's Systems & Networking Research Group, and an outgrowth of the company's Shield initiative to block network worms—could one day even become Microsoft's answer to zero-day browser exploits such as the WMF (Windows Metafile) attack that spread like wildfire in December 2005.
More here.
That's all folks