Don't believe I've ever seen flights from Montreal to Phoenix this cheap before. They're about half of what they normally bottom out at.

Update 1 - Looks like Feb 13 to 20 is now available for the same price.
------------

There's been a lot of price drop activity to Central America lately, notably to the following cities in the months of February, March, April and May...

There are some very cheap flights to Guayaquil, Ecuador (GYE) at the moment. They're available throughout March, April, May, and June of 2012. It's definitely rare to see flights to South America this cheap.

Update @ 10:51AM - The $297 fare now looks to be sold out. Getting the 'unable to confirm' message on Orbitz now.
------

Update: Looks like Air Canada is now sold out of the cheap price, it's showing as $980 for the same flight now! Congrats to those that snagged it.

Those of you that have been following my posts for nearly a year might remember the Expedia flub last November that lead to packages to Vegas for as cheap as $19/person after taxes & fees for flight + hotel packages from all across Canada.

Update @ 5:23 PM : Delta seems to have caught on and the price is now back up unfortunately. There were reports that the reverse was working for a while as well (out of a Canadian city, back into a U.S. city). Could still be worth trying.
-----------------

Update: Sep 8 - Flights from Montreal to Denver seem to be experiencing a similar price drop on Delta, for anyone that likes to ski, you seem to have your choice of dates.
-----------------------