CSHTML files need a design surface just as much as any other HTML. Please include support for this in EW.

Add the ability to easily add and update jQuery UI widgets

Mobile web browsing is predicted to overtake desktop browsing in the next two to four years depending on which survey you read. In some markets it's already over 25%.

xWeb needs to support this and could do so by, among other things:

Supporting CSS3 media queries.

Having mobile browser sizes in SuperPreview.

Having mobile browsers available on the SurePreview Remote service.

Having built-in phone emulators. (The Slapshot add-in which used the original WP7 emulator is now broken).

Support the jQuery Moble and jQTouch frameworks.

Add the ability to add and update CSS menus

I'd like to be able to Ctrl-Click on a PHP variable, constant, or function and have EW open the defining PHP file. I'd like to be able to Ctrl-Click on a PHP include file and open that file.

A tool that lets you easily create a CSS layout by specifying header, footer, columns and sidebar

Although I use an indentation system that helps me organize and move around in code, code folding would really help with long pages, and when doing things like adding a wrapper to several extensive elements.

Add an interface that makes it easy to create and update HTML forms including client and/or server-side validation

A Customize Dialog box that does exactly the same as the one in EW 1&2. It should have three sections Toolbars, Commands and Options. We should be able to add commands to menus & existing toolbars as before, the custom toolbar addin does not go far enough.

Feature to go thru HTML file and "tidy" it by making indentations correctly, adding unmatched end tags, adding "/" for xhtml, etc

EW is one of the slowest applications on my computer. I hate how often it just seemingly locks up with out a word only to wake up again in 10 seconds. It takes 30 seconds to load. That is terrible!

Like Microsoft Word, ribbonizing the toolbars and menus of Expression Web is the right thing to do to simplify a lot the user interface

Photo gallery widget that would allow users to create a photo gallery within an HTML page

Like Expression Blend, I think there should be better integration with Visual Studio. This would work extremely well with technologies such as ASP.NET MVC.

Let VS deal with all the code behind and other business logic while allowing EW do what it does best, the views.

When you upgrade to a new version of EW, it would be great to be able to transfer all the settings from the old version to the new (program settings as well as site FTP settings, etc.).

Additional web site starter templates

Support for server side includes in Design View with the syntax:

<!--#include virtual="include.txt" --> or <!--#include file="include.txt"
--> (using whatever file extension people choose to use.)

Note that php includes are already supported

The recent article on 'Prerequisites for using Microsoft Expression Web' emphasises how important JavaScript is for the web designer and developer. It's time xWeb included full support for working with JavaScript.

When you set a class="something" and you go to an attached CSS file and start writing the dot and do ctrl-space, IntelliSense should give you " .something " as available class.