Here is the list of changes:
Changes in version 5.20 (07/25/2008)
1. RadEditor updated to version 2008.02.723
2. Changed the default editor skin to "Telerik"
1. Removed unneeded properties from the default config and tools files.
I will make sure that these are updated in the text file as well in time for the next release.
The changes in the RadEditor itself are available in the 2008.02.723 release notes (http://www.telerik.com/VersionNotes.aspx?Id=1276
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.