The Greek/Antiochian Orthodox and the Russian/OCA Orthodox tend to make the Sign of the Cross a little differently. Rule of thumb: do what the other parishioners are doing and ask your priest if you get confused.
Since many Greek/Antiochian Churches have pews, they cannot bow to the ground and touch the floor. Otherwise there would be a lot of sore heads.
So, the Greek/Antiochian Orthodox first touch the ground, then while they are arising, they make the sign of the Cross first touching their foreheads (IN THE NAME OF THE FATHER) , then stomach, then their right shoulder (AND THE SON), followed by their left shoulder (AND THE HOLY SPIRIT) with the RIGHT hand. The fingers of the hand are held differently from the latins who use an open palm. The thumb, index and middle fingers form a point (representing the Holy Trinity - three Divine Persons in One Godhead) while the pinky and the ring finger are folded into the palm of the hand (representing the natures of Christ = True God and True Man).
The OCA and Russian Orthodox Churches make the Sign of the Cross first, then they bow down and touch the floor. However, touching the floor is not done with every sign of the Cross.
For example, during the singing of the Creed, we sign at the following words without touching the ground:
I believe in One God ...
Who together with the Father and Son is worshipped and glorified ...
and in One Holy Catholic and Apostolic Church ...
We also sign at the words during the Doxology (matins), here we usually do touch the floor as in petition to help us obey His Commandments:
Teach me to observe Thy Statutes.
Teach me to obey Thy Commandments, etc.
During the Divine Liturgy
At the Trisagion during the words:
Holy God, Holy Mighty, Holy Immortal Have mercy on us.
At the Glory Be: Glory be to the Father and to the Son, and to the Holy Spirit
Before and after the reading of the Gospel.
During the words of consecration and at the Epicleisis (if we are not making a full prostration). It's rather impossible to sign while on the floor in a prostration.
When approaching to receive Holy Communion, before reaching the Priest
Blessed be the name of the Lord (3 times the Sign is made with each repetition)
All together (not counting the times during the Lord have mercy and Grant it O Lord)
the Orthodox make the Sign about 33 times during the Divine Liturgy.
The Russian/OCA churches additionally make the Sign during the Litanies when the people and the choir sing: Lord have mercy, Grant it O Lord.
Hope this helps,
Elizabeth
P.S. If I'm wrong, please correct me. I just recently was told that the Catholics touch their chests, while the Orthodox make a larger sign of the Cross by touching their stomach. In fact, the reason why the Greeks start the sign ofthe Cross by touching the floor is so that their whole body is involved in making the Sign of the Cross-- to sanctify their entire body through the Cross.