Create light-weight Diagram visualization control/wrapper.It may integrate with Telerik's Silverlight/WPF RadDiagram framework.
http://www.telerik.com/products/silverlight/controls/diagrams.aspx

T4 Templates to slect in the asp.net Wizard to provide views controllers and and data connections to services

Currently if you append or insert to an object that uses a datasource (such as grid or treeview), none of the existing entires will have the template applied. This is a major problem and should be resolved ASAP.

It would be great to have a true Timeline control for showing events overtime on a scrollable axis.

Grids correctly display aggregate information in a groupFooterTemplate, but it only shows this information when the section of the group-by is visible (not collapsed).

Is there a way to display the aggregate information in a template that shows when that section is collapsed?

It would be great if it is possible to disable certain dates in the calendar. Maybe if it is possible to pass an entire array with calendar-date-objects, it would be more convenient to disable dates or highlight certain dates.
e.g. CalendarDateObject could have 3 properties:
- CSS class (this style would be applied to that certain date)
- Disabled true/false; default = true (if disabled, date is not clickable)
- Footer text (When you hover over the date, you can see this text in the footer)

By using an array of objects, you don't have to check if a date is in a certain array to change the CSS-class of that date. In the way it is now implemented, you have to write all lines of code to check if the date is in an array.

The forum is great but missing some critical features.

- Search a specific Topic area "Kendo UI Framework" or forum like "Data Source"
- Active Threads (show threads updated to today or since last visit)
- More notification options

It would be great if the chart control was able to produce a radar or spider chart, currently we have to use Silverlight to deliver this feature in our solutions. 

Add documentation for each significant versions. I should not need to always update to latest Kendo UI each time I need to fix or improve something on already shipped app. I know most things are backward compatible, but keep in mind that not every time we can afford the time to update it.

Please consider to add closed captions / subtitles to your existing webinars as well to each future recorded webinar; CC are a very handy aid not only for people that are hearing impaired but also for people like me for whom English is not their native language.

Thank you

Kendo UI for mobile, should provide a default look for NON mobile device. 

DataSource should be more feature rich. I consider following features a must in order to be able to develop complex UI's without the current pain

- Multimple models definition
- Associations between models
   - BelongsTo
   - HasMany
- Lazy load of associations!
- Allow use a REST approach for associations (send updates over a HasMany association to a service)
- Allow send the complete object

- Association validations
   - Unique
   - Exists
   - Min/Max number of elements

Have a setting causes only the most specific event handler to be fired/triggered.  This would be similar or identical to how a browser determines which value a property will receive when competing selectors are trying to assign it.  http://webdesign.about.com/od/advancedcss/a/aa062706.htm

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It would be nice to have a wrapper for RadChart to Kendo DataViz or extend RadChart to use SVG and VML to have animated charts like the ones on Kendo Dataviz

The vertical scrollbar is visible in Firefox but not Chrome, but only when using virtual scrolling. For Chrome users, it's impossible to see that there is more data available like this... See e.g. here: http://demos.kendoui.com/web/grid/virtualization-local-data.html

1. Dynamic content issue: Click on a tab with AJAX content, and it loads slow, while it's loading click other tab with AJAX content. You will get 2 opened tabs with loaded content as 2 divs one under another.
2. When you put your tabStrip on very end of your html document and when you want to change its tab at 1st tabStrip toggles active one (that's why html doc shrinks) and shows new one. It's content is below and you have to scroll whole page to see it. You can investigate it even in your demos pages.

It would be nice to be able to display data visually - basic network graphs using layouts such as Hyperbolic tree and Radial tree. 

Provide context menu support for treeview. At least provide mouse click handlers for treeview.
Also how to add items with id from datasource in treeview. You have API to select via item id, but nothing that adds id via datasource.