We too, Oleg! Unfortunately, we still have not decided on when we will start working on 3D charts. We did a bit of a research though, and we will need to make some improvements to the chart engine before we are start development of 3D chart. Most of these improvements are scheduled for Q1 2008, due in April. We will post them in the ASP.NET and WinForms Roadmaps in the next couple of weeks.
I am sorry for keeping you waiting. We are on the right track, it is just that it will take us a bit longer to introduce this feature than we initially anticipated.
the Telerik team