If you need to book a flight that is before October 31, 2009, now is the time to book!!
WestJet has put a discount code on Twitter to use before August 20, 2009, however you have to fly by October 31, 2009. Use discount code TWEET2 and you will get a 20% discount on all flights booked within Canada and the United States.
Thank you woski for the information.