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Getting Around: Montreal has an excellent métro (subway) and bus system. Visit the STM site - Tariffs for details on tickets. Buy the strip of 6 tickets which is the best choice for most tourists taking around 3 trips per day, but don't need to use it for multiple days.
One important problem for US travelers - the STM site says a credit card can be used, but a bunch of cards I tried (with US billing addresses) were all refused by the automated machines. This was later confirmed in the Montreal Gazette newspaper - Metro only accepts Canadian credit cards. So, take cash to buy any STM tickets.

For three consecutive days, the 3-day tourist pass is good deal, while the 3-day regular pass is a even better deal. There are two versions of 1-day and 3-days passes - the tourist versions are more expensive, with the only difference being that they can be bought in advance.

For tourists visiting for a week and starting on Monday, the CAM hebdo - a weekly commuter pass is a good deal.

Subway to bus transfer or vice-versa is free to continue a journey, remember to hold on to your ticket for the entire ride. More details on the Metro at the STM Metro and Bus official web site. And pictures and more details on the new OPUS card also available in the albums section (click on image shown).

Parking is a major hassle on the streets downtown, and parking lots are very expensive. Moreover, driving downtown is just no fun, especially along Ste-Catherine (always avoid), or the lower part of St-Laurent. Avoid driving as much as possible. For any street parking, be sure to learn enough French - names of the days of a week at least - to navigate the multiple signs that apply to street parking. Paying for parking since 2010 is nice and easy now that they accept credit cards. Unlike the Metro, the street pay parking stations accept US credit cards.

East-West street addresses in Montreal will have an East (Est) or West (Ouest) designation. The street that separates East from West is boulevard St-Laurent, also known as the Main. This is very important because looking for 4400 Jean-Talon without knowing if that means East or West of St-Laurent would mean a lot of time spent in searching to find the right place!