The old MAT135/136 webpages have been removed. The new MAT135H1F webpages will be posted here in September 2014.
The textbook for MAT135H1 and MAT136H1 (for the summer of 2014 as well as the 2014-2015 academic year) will be:
Single Variable Calculus, Early Transcendentals version - 7th edition - by James Stewart (Publishers: Brooks/Cole).
You should also buy the Student Solutions Manual which accompanies the above textbook.
Note that the 7th edition is not the same as the 6th edition and has a variety of new exercises, among other changes. Of course, only the new Student Solutions Manual has the solutions to the new exercises of the 7th edition.