It works with a bunch of small browsers I’ve thrown at it – w3m, mobile Safari, Blackberry – so I know I can use it from a handheld. Yay!
Only minor annoyance is that for subway journeys, it only shows the direction of travel in the summary (“YONGE-UNIVERSITY-SPADINA TOWARDS DOWNSVIEW” – and yes, in all-caps) and you have to click through to the details to find out which station you need to get off at.
It does seem to get deeply confused at Kennedy Station; I live just south of Kennedy, and it expects me to take the 43 Kennedy north to the junction to Eglinton, then walk south. Everyone here uses Transway Crescent …
Update: how could I have missed the prettier and much less capslockier MyTTC?
Update 2: The official TTC site appears to have moved here http://www3.ttc.ca/Trip_planner/index.jsp?useplanner=true. Let’s see if it still works with mobile devices.