Interesting article here on how to properly remove TM1 portlets from cognos:
http://www-01.ibm.com/support/docview.wss?uid=swg21619034&myns=swgimgmt&mynp=OCSS9RXT&mync=E
Blog of IBM Cognos TM1, Cognos BI, Cognos Express, CDM and other related stuff.
