I imagine this would be difficult, but it's a feature that we would most certainly need if we ever were to make this our primary framework...  A server-side excel file could be generated as-is, but the problem is that users expect the document to be identical to the grid they are viewing.  If they do any filtering/grouping/sorting, they expect the resulting excel document to match.  The current Telerik winforms RadGridView does a wonderful job at this and produces an xml excel document - this would be the ideal behavior to duplicate..

Grid on grouping show count of the grouped items in the group header. Its a pretty known functionality.

Please provide support (e.g. base classes) to help structuring and modularizing applications. Otherwise the framework is another control library and will not compete with full JS/HTML5 like frameworks like Sproutcore, ExtJS4. Most of the UI frameworks lacks of such support, especial for building serious enterprise applications.

Please add labelText option to the DropDown and ComboBox controls so it would be easier to add labels instead of having to manipulate the data source (especially when using a remote data source) to insert a first option as a label. This is currently an annoyance with the Telerik Controls as well. Thank you.

Something simple like:

$('#Country').kendoDropDownList({...
  dataTextField: "CountryName",
  dataValueField: "CountryCode",
  labelText: "[Select Country]"
});

This would eliminate lots of unnecessary coding or messing with the .js files to implement this ourselves (and having to re-do it each time when upgrading).

I would really like to see a Gauge control similar to what is available through the Telerik Silverlight controls.

Having the ability to do "in-line edits" can sometimes be helpful.  Here is a link to a jquery plugin I use often. Perhaps this would be something useful for Kendo.

http://www.appelsiini.net/projects/jeditable

SNS and e-business always use this for make a comment.

Just like jqGrid~ and user can chioce which col can be hide~

it seems that KendoUI will replace Telerik MVC Controls in near future. Yet there is no clear update path to inform developers about the migration roadmap (when will the mvc controls expire?). As a customer who recently bought MVC Controls, I'm also hoping for update discounts or some "grace period" (e.g. get a free kendo ui license if you bought the MVC controls 3 months before Kendo's launch)

When we do some pages just like register, we need step by step, a smart wizard plugin will be useful.

Having the ability to create "WYSIWYG Text and HTML Editor" would be excited.

http://www.kendoui.com/forums/integration/integration/kendo-ui-requirejs.aspx

when invoking kedno there is an error 'b is undefined'. You should provide information about which version of jquery is required to run kendo safely.

I use a timebar + sparklines in all our dashboards. 

http://demos.telerik.com/silverlight/#TimeBar/FirstLook 
http://demos.telerik.com/silverlight/#Sparklines/Gallery

would be great to see an html5 version of the executive dashboard

Buttons that works like checkbox. First click it is on an highlighted second click it is off

What i think of it is converting checkboxes list into more friendlu UI element. For example we have list of checkboxes with the same name but different key

Name="checkname[1]"

and so on. So i set something like

$(".checkbox[name=Checkname]").kendoCeckboxes()

Then kendo convert it in to togle buttons. You can set how namy columns for example. And it will convert to something like table with every cell as toggle button and selected options are highlighted. Of course you do not use table html elemnt i just describe idea.

This will be more friendly as on desktops as on tablets. 

Elements for trivial 2 choice radio buttons like show/hide, Yes/No, etc... Of course i can use radiobuttons but for this trivial task somethong like iPhone on/off button would be more intuitive. 

Element to chose color. That is usefull forvisual  template bulders and CSS editors and more. I am curently needing this UI

That would be great if you create UI element Ribbon. With automatic buttons scaling on window resize.

For example. I have article and I attached 3 files to it. Now i open article for edit because I want to add 2 more files but delete one. Of course i could make separate list of already uploaded files. But better would be to give to this UI element list of files to be populated on initialization.