Hi Alberto Mesa,
Unfortunately our WPF carousel does not support looping - we will try to introduce such feature for Q3 2009. The only possible alternative that I could think of is to use DispatcherTimer and scroll the carousel every second or so. Once we want to scroll beyond the last item we revert the carousel to its initial state.
I have updated the original sample with the latest changes.
Hope this helps.
the Telerik team