The last issue of "Helicopter" magazine (vol.26. issue 1/Jan.Feb.March 05)had about 12 ads. in it for "Pilots wanted".
Some do require mountain and/or longline experience. Most are for 206 and or AS350 experienced.
Link for the Helicopter Assoc. of Canada:
http://www.h-a-c.ca/hacmain.html
Maybe try this forum, as there seem to be a lot of helidrivers there:
http://www.caaviation.com/forums/index.php?