RadMenu supports multi-column rendering of child items, here
is an example. You can also bind the menu directly to xml string or xml file as it's demonstrated here
Hope this helps.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.