Thank you for the questions.
The good news is that in the upcoming Q1 2009
release, we will include vertical header text feature for RadGridView
for WinForms. It is still too early to prepare an example, but we will make one as soon as the release is available.
With respect to the Ajax controls. This behavior can be achieved via custom css code. The idea is basically to alter the css for the header, and make it rotate vertically. More information on this is available in the following article
the Telerik team