I have many PuTTY sessions on my main work PC.  I need to ensure I have all the sessions available for my support laptop at home, also I need them in case I am carrying aroung my small netbook and I need to connect to work.  I use the script below to make a copy of the PuTTY registry key to both my local PC hard drive and to my dropbox folder so I can access them from any machine.

It's a very simple batch file, please feel free to copy and distribute the script.