The RadEditor control has been available as a replacement for the out-of-the-box SharePoint Content Editor Web Part since SharePoint 2003.
In addition to a separate Content Editor Web Part, the RadEditor is also available in two SharePoint 2010 scenarios:
- Lists - replacing the rich text field and enhanced rich text field in SharePoint lists (SharePoint libraries).
- Publishing field - replacing all rich html field controls in publishing layouts (For example Wiki sites).
The two scenarios can be enabled separately on a per site or site collection basis so it is easy to get the editor exactly where you need it. The control also offers rich configuration capabilities so it is easy to apply changes to all editors on any given site.