For anybody interested, here's the calendar of Windows Phone 7 developer events:
I'll be attending the next one later this week here in southern California so I should be better educated soon enough.
Nevertheless, from my point of view, here's the argument that I think is most compelling for a Telerik suite of controls for Windows Phone 7:
I am more likely to develop a Silverlight application using Telerik Silverlight navigation paging menu etc controls if I am also able to easily apply the same approach (and programming development time) for use when I adapt the Silverlight application from the desktop browser environment to the Windows Phone 7 environment.
And vice versa, if I must develop a Silverlight application for Windows Phone 7 using Microsoft navigation paging menu controls (because Telerik controls for WP7 do not exist) then I am more likely to apply the same approach (and programming development time) for use when I adapt the Silverlight application from the Windows Phone 7 environment to the desktop browser environment.
Now the point here is simple: if Telerik wants developers such as myself to use Telerik controls as much as possible (instead of Microsoft controls), then please make it as simple and easy as possible to go back and forth between both environments, ie, back and forth between Silverlight for desktop browser and Silverlight for Windows Phone 7. And it would be really important to make this possible for all the basic "plumbing" and "infrastructure" controls such as navigation paging menu etc.
Of course, I do agree also with Troy that some additional fancy controls would be nice too.