Robert wrote:

line up behind the last car, but on the right
part of the lane.

There are intersections where I do this and even filter head so I'm
just behind the car that's at the front of the line. I almost never
pass the car that's at the front, though I've been tempted by some of
the depth-perception-challenged who have to wait until there's a full
mile of clearance before they make their turn.

There are some intersections, however, where keeping to the right in
the left-turn lane can be a little hazardous. If the opposing direction
also has a left-turn lane with a line of cars in it, they can block of
the view of oncoming straight-through traffic. The only way to see this
oncoming traffic is to take the turning lane. In these situations, I
generally start in the *left* tire track so I can see oncoming traffic
and move toward the right through my turn.
RFM
http://www.masoner.net/bike/