Was Tyler's Ultimate canceled?
I see that it's been entirely pulled off of Food Network, including reruns. The reruns on Cooking Channel are only the early, travel format shows from before TU became a more traditional cooking show.
According to FN website, there were 8 seasons. The last episode of season 8 appears to have first aired in early 2010 (judging from comments on one of its recipes).
According to the CC website, this show appears weekday mornings at 11am.
He has a web site
mainly connnected with his California store; and also Tweets
My guess is he isn't making new shows (except maybe some specials - and the next Food Truck race), but that reruns will continue during daytime hours on both channels.