My favorite customizations for Sitefinity's Rich Text Editor

radeditor.css

body { font: 1em Georgia, "Times New Roman", Sans-Serif; color: #444; }
a { color: #A82A15; text-decoration: none; }
h1 { font-size: 2.3em; margin-bottom: 20px; padding-bottom: 5px; }
h2 { font-size: 1.5em; font-weight: normal; color: #A82A15; margin: .8em 0 .8em 0; border-bottom: 1px solid #333; padding-bottom: 10px; }
p  { margin: 5px 0 15px; line-height: 1.6em; }
ul, ol { margin: 5px 0 15px; }
ul li, ol li { line-height: 1.6em; margin: 0.5em; margin-left: 20px; padding-left: 5px; }

/* This ensures we'll see empty tags in RadEditor */
h1, h2, h3, h4, div, p, ul, ol, pre, blockquote { min-height: 1em; }

ToolsFile.xml

<?xml version="1.0" encoding="utf-8" ?>
<root>
  <modules>
    <module name="RadEditorStatistics" dockingZone="Bottom" visible="false" />
    <module name="RadEditorDomInspector" visible="false" />
    <module name="RadEditorNodeInspector" visible="false" />
    <module name="RadEditorHtmlInspector" visible="false" />
  </modules>
  <tools name="MainToolbar">
    <tool name="ToggleAdvancedToolbars"/>
    <tool name="Bold" shortcut="CTRL+B"/>
    <tool name="Italic" shortcut="CTRL+I"/>
    <tool separator="true"/>
    <tool name="InsertOrderedList" />
    <tool name="InsertUnorderedList" />
    <tool separator="true"/>
    <tool name="LinkManager" shortcut="CTRL+K"/>
    <tool name="Unlink" shortcut="CTRL+SHIFT+K"/>
    <tool name="ImageManager" shortcut="CTRL+G"/>
    <tool separator="true"/>
    <tool name="FormatBlock"/>
  </tools>
  <tools>
    <tool separator="true"/>
    <tool name="AjaxSpellCheck"/>
    <tool separator="true"/>
    <tool name="PasteFromWord" />
    <tool separator="true"/>
    <tool name="JustifyLeft" />
    <tool name="JustifyRight" />
    <tool name="JustifyCenter" />
    <tool name="JustifyFull" />
    <tool separator="true"/>
    <tool name="Indent" />
    <tool name="Outdent" />
  </tools>
  <tools>
    <tool name="FontName" shortcut="CTRL+SHIFT+F"/>
    <tool separator="true"/>
    <tool name="RealFontSize"/>
    <tool separator="true"/>
    <tool name="ForeColor"/>
    <tool name="BackColor"/>
    <tool separator="true"/>
    <tool name="MediaManager" />
    <tool name="FlashManager" />
    <tool name="DocumentManager" />
  </tools>
  <tools>
    <tool name="InsertParagraph" />
    <tool name="InsertTable" />
    <tool name="InsertSymbol"/>
    <tool name="InsertHorizontalRule" />
    <tool separator="true"/>
    <tool name="Superscript" />
    <tool name="Subscript" />
    <tool separator="true"/>
    <tool name="FormatStripper"/>
    <tool separator="true"/>
    <tool name="FindAndReplace" shortcut="CTRL+F"/>
    <tool name="Print" shortcut="CTRL+P"/>
    <tool name="ToggleScreenMode" />
  </tools>
  <cssFiles>
    <item name="~/Extensions/RadEditor/radeditor.css" />
  </cssFiles>
</root>