Compass electronic fare card progressively on buses, trains and ferries, saying "... we've learned from cities around the world that extended-delivery schedules are common with major-system changes...". That is certainly the case in Sydney, with the Tcard system supposed to be in place for the Sydney 2000 Olympics, but abandoned in 2007. The replacement Opal system has started being used on ferries and trains (and some buses from Monday). But when I went I tried clicking on "View a list of bus services that accepts Opal" the page was not found.
ps: I had hoped to try Vancouver's Compass card later in the month, to get from the airport (and avoid a $5 surcharge which international passengers are slugged with). But the smart cards are not generally available yet.