For men and women, what are the traditional ring fingers for wedding
rings, engagement rings, and if rings are exchanged with no sort of
commitment?

Assume that the rings are worn separately, and not all at the same time.

Hello Burnt_toast~

The "correct" ring finger has changed over time, and may vary
according to where you are in the world; but in the United States and
throughout most of Europe:

Wedding Ring: Worn on the fourth finger (the one next to your pinkie),
left hand for both men and women.

Engagement Ring: The fourth finger, left hand for women--and men, in
countries where men wear engagement rings. Once married, the wedding
band goes on first (nearest your palm), followed by the engagement
ring.

Other Rings: If the ring is not an engagement or wedding ring, it may
be worn on either hand, and on any finger except the fourth finger,
left hand.


Regards,
Kriswrite

For more information, see "EZ Wedding Planner:" 
http://www.ezweddingplanner.com/advice/ringorder.cfm


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thanks!