For those of you that are using Visual Studio 2005 SP1, you may have run into an issue where typing certain constructs in an XML doc comment (i.e. <![CDATA[]]> or <!---->) would cause the IDE to become unresponsive.   

Below is an example scenario where this behavior can be observed:

1.   Open Visual Studio 2005 SP1
2.   Create a new C# class library project
3.   Type ‘///’ before the class definition to auto-generate the XML documentation comment
4.   Add a <![CDATA[]]> section in the XML documentation comment
5.   Try adding characters such as ‘<’ in between 'CDATA[' and ']'
6.   The IDE will become unresponsive

To address this issue, we've released a public hotfix that you can download at: https://connect.microsoft.com/VisualStudio/Downloads/DownloadDetails.aspx?DownloadID=9646.

I hope this helps!  Please let me know if you have any questions or comments.