Currently, if a RadWindow is maximized, then minimized, then restored it will get the dimensions it had before maximizing. A window in the OS will maximize if it had been maximized prior to minimizing and the RadWindow should have the same behavior.

Instead of pages like this, which exist for every control and aren't very helpful:
http://www.telerik.com/help/aspnet-ajax/scheduler-appearance-skins.html

I think the skins page should actually render the control and allow developers/designers to select a skin from a drop down to properly demonstrate how the control appears in that skin. 

The logic behind this is somewhat similar to the property explorer pages. As with the property explorer pages, the RenderMode should also be selectable from the proposed skin page because it affects the way the skin is rendered. 

Without this feature I find myself starting a test page, typing in a skin name, save changes, load page, new skin name... repeat, repeat. Please add this feature to make this process a whole lot easier.

Certain controls just add bloat to a page.  Like the RadListView is a GREAT control to use inplace of the asp Repeater, but I find I often don't use it (or limit it's use) because it brings down 99.9% useless client scripts.  Most of the time, especially in Sitefinity its a server-side render-only control.  Just used to show data...we don't need ANY client manipulation.

The new scaffolding capabilities in ASP.NET web forms are great for productivity.

I'd like to see Telerik-specific scaffolding that substituted Telerik controls.