>Any links out there? Can't seem to find any that do OSI over IP tunnelling.
>I can find those that will allow me to enable IS-IS routing for CLNS or do IP over OSI tunneling. None for OSI over IP tunnelling. Any pointers are  appreciated.

What router are you using ?

Enabling IS-IS routing should be as simple as:

 (in config mode - enable clns routing)
clns routing

(in config mode 0 define the area name + address)
router isis <clns >
 net <NSAP Address>

(in interface/subinterface - enable ISIS on a particular interface)
clns router isis <area name> 

you can do the clns tests:

ping clns <nsap address>

show clns neighbours

look around the cisco site - there were some docs there some times ago.

http://www.ciscopress.com/articles/article.asp?p=31213

Regards,
Josiah