The opening round match-ups are set for the 3rd Ontario Cask IPA Challenge: http://caskdays.com/ipachallenge.html
The winner of the first Challenge in 2009 was Duggan's Number 9 IPA. As fashionable as it was to knock Duggan's beers, it goes to show what a blind tasting can achieve.
I was able to make it out for the final round of the 2010 Challenge. By this point in the festivities, it was not a blind taste test and I ended up narrowly favouring Smashbomb Atomic IPA by Flying Monkeys (formerly the Robert Simpson Brewing Company) over Great Lakes' My Bitter Wife. The Great Lakes was the eventual winner but not by much.
This year's Challenge is on the same weekend as the Mississauga Marathon, not to mention the Toronto International Marathon. Self-preservation dictates that I am likely to give this a miss.