First, get informed on the situation.
http://monitter.com/ is a real time Twitter Tracker that is currently set on the #IranElection, #Tehran, and #Mousavi hashes. It updates automatically so you don't have to keep refreshing.
Alternatively, you can use twitter's search page.
Searching for a hashtag will show all recent posts under that tag.
Contact the Canadian Government and ask them to allow wounded protesters in to our embassy for medical help and treatment.
Find your MP By Postal Code
Prime Minister Harper
Foreign Affairs Minister Lawrence Cannon
Fax : 613-992-6802
Canadian Embassy in Iran
Email : email@example.com
Cyberwar guide for the Iran elections - A Guide to helping the Iranian Protesters on the internet.
If you have any other ideas or suggestions, or links to articles showing how people can help please post them in the comments.