SharePoint Invalid Characters

According to KB article 905231, SharePoint has very specific reserved characters that are invalid for use in site names, subsite names, group names, folder names, and document names.  This is frequently overlooked by SharePoint users.   I would hazard a guess that many end users are not even aware of this information.  How could users be aware of this when SharePoint lets users create content that contain these invalid characters?  Please ensure that you and your fellow SharePoint users are aware of the following invalid characters:

• Site Names
• Do not use the following: | # { } % & <TAB>" ~ + \ / : * ? " < >
• Do not start a site name, subsite name, or a site group name with an underscore (_) or with the period character.
• I recommend that you do not use an underscore or a period.  While it is possible, there are some caveats, such as: 
• You cannot use the period character consecutively in the middle of a site name
• You cannot use the period character at the end of a site name
• Folder Names and File Names
• Do not use: " # % & * : < > ? \ / { | } ~
• File names cannot be longer than 128 characters
• Do not use the period character consecutively in the middle of a file name.  For example, "file..name.docx" is invalid.
• You cannot use the period character at the end of a file name
• You cannot start a file name with the period character