FYI - we have a commercial version available for very low cost ($100 US) - it adds a management interface for the administrator. The script terminates Outlook if running and forces the appropriate signatures for new and reply messages. PM me for details.
The upgraded version is based on the publishd code and was developed in response to several large financial, legal, and travel clents that needed to present a consistent email signature - no political, religious, or sports messages that could offend the clients. (Imagine "Go Manchester!!" being reveived by a client that's a die-hard Dallas Cowboys fan! 
) One of the options is to delete and recreate all sigs on login to insure compliance with policy.
Sigs support HTM and TXT formats and have no software dependency other than Outlook. There are several HTM and a single text template included in the package, and we can develop a custom template if required. Templates are simple HTML and easy to modify.
One cool feature that was used by the travel company was the ability to reference a server-based image in the signature. Each of their 430 departments/retail centers then had an individual image "tile" (always the same size) that represented the current week's featured destination or travel bargain. The art dept simply replaced the appropriate tiles and the sig image instantly changed for all users associated with those tiles with no end-user actions.
Glenn
_________________________
Actually I
am a Rocket Scientist!
