Such functionality would improve the user experience for UI interaction of the end-users with the RadEditor tools.

Such behavior can be achieved using the following customization with the RadEditor control:

<telerik:RadEditor ID="RadEditor1" runat="server" OnClientLoad="OnClientLoad">
</telerik:RadEditor>
<script>
    function OnClientLoad(editor, args) {
        editor.attachEventHandler("onkeyup", function (e) {
            if (e.keyCode == 27)
            {
                closeContextMenus(editor.get_toolAdapter()._contextMenus);
            }
        })
    }

    function closeContextMenus(contextMenus) {
        for (var menu in contextMenus) {
            contextMenus[menu].hide();
        }
    }
</script>

Elapsed time, Estimated time and Speed are not calculated correctly. 

At present, when a Telerik product is installed via an automated installer (WebInstaller or a downloaded MSI package), a shortcut to it is added on the desktop.

This feature should be optional, e.g., via a checkbox during the installation wizard.

Here is the missing resource name: pTelerik.Web.UI.Skins|Telerik.Web.UI.Skins.Web20.Common.radGradientListSprite.png
You can see if this is your case as well by decrypting the WebResource request that fails as shown here: http://blogs.telerik.com/aspnet-ajax/posts/07-03-27/debugging-asp-net-2-0-web-resources-decrypting-the-url-and-getting-the-resource-name.aspx

Please create high contrast theme for people with disabilities.

The best colors are yellow and black and there should be two combinations: yellow on black and black on yellow.

Please look at attachements for very good example.

When adding a link with a class name, the Unlink command cannot remove the formatting. 

Temporary solution is to clear anchor's classes programmatically via the ApplyClass command:

<telerik:RadEditor runat="server" ID="RadEditor1" OnClientCommandExecuting="OnClientCommandExecuting">
    <Content>
        <a href="http://www.telerik.com" class="my-class">link</a>
    </Content>
</telerik:RadEditor>

<script type="text/javascript">
    function OnClientCommandExecuting(sender, args) {
        var command = args.get_commandName && args.get_commandName();

        if (command === "Unlink") {
            var myArgs = new Telerik.Web.UI.EditorCommandEventArgs("ApplyClass", null, "");
            sender.fire("ApplyClass", myArgs);
        }
    }
</script>

The text in the tabs' titles of the Sliding panes of the Splitter control are not properly rotated.

Can be reproduced here:
http://demos.telerik.com/aspnet-ajax/splitter/examples/overview/defaultcs.aspx

http://demos.telerik.com/aspnet-ajax/splitter/examples/sp_firstlook/defaultcs.aspx

There are several other suggestions along these lines, but in general, Telerik needs to make their data input controls more consistent in the implementation of a "Label" property. Without such consistencies, it makes including controls that have this property and those that don't together on the same page much more difficult. As of the writing of this, the DropDownList and DatePicker controls do not have a Label property. There is no apparent reason why this should be so.

All of the input controls should have this property.

Related requests:

http://feedback.telerik.com/Project/108/Feedback/Details/149658-add-built-in-label-to-control

http://feedback.telerik.com/Project/108/Feedback/Details/66117-add-label-property-to-ajax-raddatepicker

Related annoyed forum thread about the omission of this property in the DropdownList control:

http://www.telerik.com/forums/dropdownlist-label#TI3zWYeMFESXjPIY_bYjZg

Possibly as an extension of the Media Player... a Web Cam recorder.

When the Navigation control collapses into the hamburger menu keep the hover to expand the menu items functionality.