try the taxact website...
www.taxact.com
try this also
http://www.google.com/search?sourceid=navclient&ie=UTF-8&rlz=1T4GGLJ_enUS267US267&q=T5008
this might give you the exact answers you need...
http://groups.google.com/group/misc.taxes.moderated/browse_thread/thread/0edb4685f010a762
Does the T5008 show that Canada taxed you on the sale?