You can now split the editing window of code file horizontally. But allow those with larger monitor to split the windows many times both horizontally and vertically. The easy way may be allow the same file to be opened multiple times. Maybe an option to allow files to be opened multiple time without asking; with asking; or not (as it now).

When I copying text from dark theme and paste into Lync there is no background so I don't see white color on white background. It will be nice to have ability to copy source with standard formatting so it can be easily pasted to Lync, Word or PowerPoint with the light theme.

In Find and Replace dialog add new field to set the extension of files for search. For example, find all strings "hello" in *.css files.

When renaming a file in an ASP project, it would be great to have the class name in the code behind automatically reflect this change.
For example, after renaming "MyPage.aspx" into "MySecondPage.aspx" in the editor, the class name in the code-behind would be renamed as well. Currently it will still be called "MyPage".

In extent to this, when renaming a ASCX file, it would be nice to have not only its class name renamed, but also the tag names on the pages that use this ASCX file.

IMO, this would allow more effective refactoring.

Coming from an OS X background and therefore having used Xcode often, it has always been nice having the IDE automatically close my braces when I declare a method or if statement etc... Now having moved to VS I miss this a lot

I seem to recall being able to collapse HTML tags previously but now it doesnt appear to be possible.

For example:

<div>
<p>some content</p>
<p>some more content</p>
<p>even more content</p>
</div>

Should collapse to:

<div>[...]

When opening a large minimized CSS file, Visual Studio 2010 crashes. It would be nice if when opening a large CSS file, that appears to be only on one line, that Visual Studio wouldn't crash, and maybe gave options for reformatting the content.

From the description of the Productivity Power Tools extension: "As the resolution of monitors increases, it’s becoming more difficult to find the caret in the code editor." As a counter measure I suggest making the text cursor better visible by increasing its thickness from the current one pixel (that's getting thinner and thinner on high resolution monitors!) by two pixels or maybe even a configurable value. Several other text editor applications use a 2 pixel wide caret/cursor and it makes a huge difference.

Often, when I'm exploring code, I use Find all references, then drill down a bit more, do another Find all references, and 'lose' the first one. It would be a lot easier if you could do 'Back' and 'Forwards' through the history of the symbol results.

When I open a large solution which have many toolboxed items (a WF4 based solution for ex.), Studio shows Toolbox Menu items in expanded state at default. If I have quite many namespaces, this is a pain to collapse'em all by hand every times when the solution opens.

It would be great to fold all kind of code blocks and not just methods like you can do it in Notepad++.

Just like right click goto definition, it would be great to be able to right click on an "end if" and go to the actual "if" statement. This would be useful with loops and other constructs as well. Or, when hovering over an "end if" you could show the "if" as a tooltip.

The title says it all. Every ******* IDE has it except VS. It's ridiculous since it's one of the most basic features.

When performing code comparisons from within Visual Studio, the default code comparison tool is still the original source code comparison tool that shipped with Visual SourceSafe. Instead, a more sophisticated and modern code comparison tool should be shipped out-of-the-box with Visual Studio rather than having to resort to 3rd party comparison tools such as Beyond Compare.

Currently in VS2010 intellisense doesn't behave the same between the code editor and XAML which is unfortunate. I've grown used to the partial match (smart match?) style intellisense in the code editor and would like it to be available and enabled by default in XAML. For more information see Karl Shiflett's XAML Editor IntelliSense Presenter Extension for VS 2010.