Changes (ledjon {at} ledscripts.com):

* 1.6 -> 1.8
 - Added check to install.php to test for the InnoDB table
   type for mysql installations.  This should help users
   determine if they have InnoDB enabled or not.

 - Allow the user to remember login details when they sign in
   Note: This wont work until the data has been sync'd from
   version 1.6 to 1.8 (or higher), as it requires a new table
   in the database (plm_cryptcheck) to enforce this change.
   -- it also requires cookies to be enabled
   
 - Fixed bug in the 'plain version' of the message being complete
   ignored (oops!)
   
 - Added back-end validation of the users email adress format.
   This can be enabled/disabled from the configuration menu
   
 - Added a couple safe_mode checks
 
 - ++ Allow the user to put "variables" within the mail message
   subject and body ({firstname}, etc).
   
 - Allow the first name to be null when a user subscribes.
   Note that if you truely want this check gone, you have to remove
   it from the signup page's javascript checks.
   
 - Messages can now be taken 'Off-Hold' without editing the message, by
   clicking on the 'Yes' link under 'OnHold' in the listing.
   
 - Upgraded WYSIWYG editor to FCKEditor 2.0
 
 - Added error level initialization to compensate for sysadmins that
   have error reporting set to strict
   
 - Created phpLedMailer Web Service Interface

* 1.4 -> 1.6
 - Removed fckeditor 1.6 and replaced it with FCKEditor 2.0FC
   This includes support for FireFox.
   
 - Removed .htaccess file requirement
   This was previously needed for starting sessions
   as well as turning off magic quotes
 
 - Fix for naming of mysql table creation
   (ENGINE to TYPE for old versions of mysql)
   
 - Implemented various FireFox-campatibility fixes
 
 - Implemented file uploads (images) for the wysiwyg editor
 
 - Fixed minor bug in templates called
 
 - Fixed 'bug' in data sync that would cause the execution to timeout
   The script will not attempt to run until the web server kills it -- a
   step which the script has no control over.