I'd love to be able to do fractions in the NumericTextBox

...fractions are numbers too! ;)

Or more flexible:

Allow developers to handle user's click on a DataViz legend item.

And provide the possibility to set/reset the visibility of a DataViz serie not only his opacity.

For the app we're currently building, a chromeless, modal window would have saved us lots of time and coding and there are other applications where this could be very useful (especially in the ad serving industry for instance allowing affiliate marketers to place various javascript widgets on their sites that load remote content, etc). 

It looks like a Funnel chart type is one of the typically missing chart types from many html5 chart libs, currently. 

It's pretty useful and including it in dataWiz would give you a competitive edge towards other chart libs ;-)

Make better kendo framework documentation. Demos are fine but it does not have many of the necessary information.

Update dependencies in documentation + add dependencies info in the beginning of each source code file.

KendoUI has window widget, but it's too simple, I suggest just like jbox or artDialog.
jbox:http://kudystudio.com/jbox/
artDialog:http://www.planeart.cn/demo/artDialog/index.html

Maybe CSS3 can do more nice text,textarea,button, but in IE7&8, can not support border-radius,box-shadow,text-shadow, so we must use picture to do this. I want to all the form element seems the same in KendoUI support browsers.
Just like: Uniform,Niceforms,Jquery FormOne,jqTransform,jNice and so on...

Also added to the file manager and editor will be perfect

http://www.kendoui.com/forums/ui/general-discussions/touch-counterpart-to-mouse-hover-touchhold.aspx

I would really like a ProgressBar control. The reason why I want a progressbar control in kendo ui is so that the look and feel of my application is consistent throughout.

The minimize function does not work when added to a kendoWindow. A North pointing triangle is added to the title bar bu nothing happens when clicked.

Also restricting the Maximize to the parent containier (DIV) as suggested by another user should be implemented soon.

ASP NET MVC provides jquery.validate.unobtrusive validation that, using jQuery validation, let us set validation attributes into model class.
http://weblogs.asp.net/mikaelsoderstrom/archive/2010/10/06/unobtrusive-validation-in-asp-net-mvc-3.aspx
Would be nice if it may work also with kendo ui validation.

You have datepicker.
You have timepicker.
Why not datetimepicker?

A single input box that selects both a date and a time.

Should be fairly straightforward, it just needs to display both ui widgets simultaneously and handle the different parsing in and output logic.

I'm following the launch of Kendo UI closely.
IMHO what Kendo has to do right now is post a demo of a medium sized web app (>20 screens) showing us how to integrate al the pages eg via the menu widget.
The To-Do-List sample app is learning us nothing.
2 years ago, I've bought, studied, tested, flamed, ... ExtJs and never got to the point of building a decent web app.
This was THE MAJOR complaint of the ExtJs newsgroups. They have a lot of small widget demos but how do we integrate them into a medium sized app eg a webshop.
So, Kendo UI, please don't make the same mistake. 
Show us a medium sized web app with all the widgets and - most important - how they interact with each other.

regards

Patrick De Laet
patrick@fijisoft.be

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

Right now, editing in the grid seems to be on a per-cell basis.  I would prefer a model where each row has an edit button, and when clicked, it would put the row into edit mode.  A save / cancel button would then be available to validate and save or cancel the edit.