Add the ability to reorder columns (and their data) within the Kendo UI grid. This would preferably be handled through drag and drop. 

I've implemented a large list of options in a listview that I expect a user to select one from.
I am detecting the selection by the 'click' event, but this fires even when the list is scrolled.

Add spell checker to the new Rich Text Editor similar to the other Telerik Editors.

It would be nice if you could add a disabled state for k-button.  That way, we don't have to hide the buttons from the users to force them to enter some information before clicking a button.

Support for spline chart type

 For example the grid with filtering turned on appends multiple div and form elements to the body element. It is impossible to clean these up which is very important in a single page application. Every widget should have a destroy method which is capable of removing any associated events and elements it was responsible for creating.

Could I suggest a better integration with Phonegap like:

- desktop utility app to package Kendo UI Mobile app into installable packages for iOS, Androind etc..

To produce the bugs:

Edit a cell value then the red mark appeared.
 Edit another, the mark is on both cells.
 Click on the first cell, not modify just click the 3rd cell, and the modified mark is disappeared. ( but the cell still modified from the zero state )

Edit a cell value then the red mark appeared.
 Insert a new row, and the mark is disappeared too.

Sorry my English is bad.

István

Why don't add useful tips for paging?

just like:
http://demos.telerik.com/aspnet-mvc/Grid/Paging?theme=vista

or jqgrid

Could you guys add normal user controls like a dropdown list on the mobile framework. On the android the <select> element does not work. It's grayed out?

Really nice feature for the planned rich text editor would be to add a config option to show the toolbar only on focus/mouse over and possibly have it floated on top of the content so something similar to this could be achieved:

http://www.formstack.com/assets/images/LandingPage_Step2.png

Do you have in your Road Map Mobile Charts or is the idea to use the DataViz charts?

Let Kendo work with KnockoutJS.

When initializing a WINDOW component, you should be able to specify where the window should be rendered. Currently all windows are treated as modals and placed before closing the BODY tag.

This feature is vital and also will help developers in creating dashboards and custom tiles views. 

Please consider implementing a Multiselect control similar to how this jQuery plugin, Chosen, works. Look at their Multiple select and Multiple select with <optgroup> examples:

http://harvesthq.github.com/chosen/

I really like what you've done so far and I think you're very close to the top if not already there in terms of being an HTML5 UI leader. The one thing your data visualization set is missing is a map. A simple map to show chloropleth data, basic paths etc is well within your reach and would round out your DataViz offering.

A flip animation when changing between views, links etc. 

For an example, check the Yahoo weather app on iOS. Click (i) to add/remove/reorder locations.

For another example, check the Yahoo stocks app on iOS. Click (i) to add/remove/reorder stocks

Because better Documentation and Real World Solutions is in the planned phase, it would be nice if you created a forum specifically for the current users to post their own project code and examples under kendo UI Web.  This forum would be a good place for people to search for real help when the current demos fall short.  Your current forum structure wouldn't allow for posting anywhere but in General Discussions.  The code would be lost in all the discussion posts  if the examples are a mix of widgets, they don't pertain to a specific widget..

Speaking for myself and the rest of the user community, we would be more than happy to upload the work we have been doing.

Create RichTextEditor Widget which is integral part of all content management systems. Also, it would by nice to create checkbox widget.