20 Feb 2010
13 Feb 2011
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The Telerik.CMS assembly has been replaced with the Telerik.Sitefinity assembly.
You should also investigate the Sitefinity 4.0 Navigation widget, because it is one of the most useful improvements I've seen in Sitefinity 4.0. The pre-defined formats (ex. vertical menu of select items) are convenient and allows for the creation of sidebar menues with full control over which pages to include on it.