Here is the T3010-1 Registered Charity Information Return which replaces the T3010B for charities with fiscal year ends on or after December 1, 2010. [ed. CRA has subsequently said the T3010-1 can be used for fiscal year ends after March 4, 2010]
Here is a link on the CRA website: http://www.cra-arc.gc.ca/E/pbg/tf/t3010-1/README.html
The new guide should be available in January 2011.
Do you require legal advice with respect to Canadian or Ontario non-profits or charities?
Mark Blumberg is a partner at the law firm of Blumberg Segal LLP in Toronto and works almost exclusively in the areas of non-profit and charity law.