I have just made an RPM and a How To for Jabber Transports. It assumes that you have installed Jabber server as per Noah Genner's Jabber Server How To at
http://www.genner.on.ca/noahville/mitel/jabber-howto.htmand are comfortable making changes to the jabber.xml file.
The How To and RPM can be downloaded from
http://www.khunjarnet.com/downloads/jabberThe RPM installs all the Transports and you can select which ones you want by adding the appropriate services in the jabber.xml file.
So far I have tested MSN and Jabber User Directory on SME 5.1.2 only and both seem to work.
Jon