Some motorists seem to forget that when they find themselves driving behind a slower-moving bike, they DO have the option to just slow down for a few seconds before they find a good opportunity to pass. Sounds silly, but I think many motorists have not even realized they have the option of slowing down briefly and waiting to pass when the opportunity presents itself.  I have seen some incredibly silly and very dangerous driving by motorists obsessed with passing a cyclist immediately when they encounter them (not sure where this behaviour originates, but it is really dangerous for everyone).

Cyclists on a roadway are considered to be vehicles with all the same responsibilities and privileges as any other vehicle.  If you come to an intersection, and there is a cyclists present, remember that they should be offered the same right-of-way as a car (this applies both ways: don't yield the right of way just because it is someone on a bike as this can put them in danger, and don't think a car ALWAYS has the right of way of bicycles).

While cyclists are required to travel as far right as practicable on the roadways, it is not always possible and/or safe to do so.  When you see a cyclist in the centre of a lane, they are likely riding there to be safe or to avoid something on the edge of the roadway that you can't see from your car.  Please slow down, exercise some patience and wait for a safe opportunity to pass. 

Cyclists, like motorists, are people too. Many motorists see unlawful behaviour by other drivers (e.g., speeding, distracted driving, failing to stop completely at stop signs or red lights, etc.) practically every time they make a trip by car.  So when you see a cyclist exercising poor judgement and behaving unlawfully, too, remember that they are people just like the motorists who disobey the law. Please don't hold cyclists to a much stricter standard of conduct, especially since a bicycle conveys much less potential to injure someone or cause property damage than a multi-ton motor vehicle.

Just because someone is riding a bicycle doesn't mean they are travelling slow.  On residential streets a bicyclist may be travelling close to or at the speed limit, particularly on downhills, with a tailwind or in playground zones.  Likely a bicyclist travelling at higher speeds will move further into the traffic lane to asser themselves as a fast vehicle and for safe clearance from hazards common when riding close to the curb (pot holes, gravel, vehicles entering intersections, driveways).  Before assuming you need to pass the bicyclist, please check you speedometer and ensure that you are not passing the bicyclist under the assumption they are moving slow.  If the bicyclist is travelling near to the speed of traffic it is best to wait until they have slowed down and moved over before you pass.

If you are passing a bicyclist on road with multiple lanes in each direction, consider yeilding the lane to the bicyclist by moving fully over into the left lane.  Return to your original lane once you have safely passed the bicyclist.  This is a great way to safely share the roadway without the need for dedicated bicycle infrastructure.

Bicyclists have a legal right to use both roadways and pathways.  In practice roadway and pathway junctions, particularly at intersections, do not necessarily clearly accommodate cyclists travelling between one type of infrastructure and another.  While you may find bicyclist behave unexpectedly at such points, keep in mind it may be that the bicyclist is trying to make do as best as possible with the infrastructure available. 

A couple sources:

http://www.edmonton.ca/transportation/cycling_walking/one-road.aspx

http://www.edmonton.ca/transportation/cycling_walking/information-for-residents-and-motorists.aspx

Passing at the last second, so you are waiting at the light ahead of a cyclist is dangerous and unecessary. Same goes for passing in an intersection.

Driving at slower speeds makes it safer for everyone - pedestrians, cyclists, other cars and yourself! It also makes it much more enjoyable to drive around.

(something along those lines)