Re: streetcars, let's not forget that light rail/subways/s-bahn/whatever in MANY cities run on much longer headways than our streetcars, even when those streetcars are bunched up and off schedule. What is the average time between trains on the Montreal metro? 8 minutes or so off peak, right? Some of the outer El lines in Chicago are even longer than that.
As far as speed of travel, streetcars are fundamentally different from busses in that they don't have to pull over to stop. This eliminates a lot of dead time.
Bottom line is that I think putting streetcars on the map makes a good amount of sense. Believe it or not, one of the Fodor's Toronto guides has am amzing "downtown rail map," with subways and streetcar lines with stops! It might be the most useful Toronto transit map I've ever seen.