These videos were released around 2012-2013 at the original launch of the Opal card.
(Archived copy of transport.nsw.gov.au/opal from mid 2013)
2012:
Opal Card – An Introduction
What is the Opal card?
How do I use my Opal card?
What type of Opal cards are there?
Where and when can I use the Opal card?
How do I get an Opal card?
How do I top up my Opal card?