I found some web sites this morning that are eye candy for transit geeks: Transit Toronto and Mike's Transit Stop. Both of these sites contain lots of images of old TTC route maps.
Some of the old maps are fascinating: the May, 1964 map shows what has to be the shortest TTC route in history. The Gerrard 38 bus ran on Gerrard Street from Main to Bingham, which is a distance of ten blocks, or less than three-quarters of a mile. It would take about 15 minutes, tops, to walk the entire length of the route. That driver must have been bored to tears by his job.
Transit lovers, or riders, should also check out Steve Munro's web site and the TTC's route schedules page.