In the meantime, here is a brief synopsis from GAMES OF THE GODS:
ALPHA- bull, cattle
BETA- the demon of duality
GAMMA-Godliness
DELTA-four elements, directions
EPSILON-ether and the Aion
ZETA-offering, sacrifice
ETA-joy, love
THETA- the eighth sphere of the zodiac
IOTA- destiny
KAPPA- bad luck, death
LAMBDA- the growth of plants
MU- the stars
OMICRON- the sun
PI- the sun as Mithras and Christ
RHO- fruitfulness
SIGMA- the God of Death
TAU- human beings
UPSILON- water
PHI- phallus
CHI- property
PSI- heavenly light
OMEGA- riches and abundance
These attributes seem quite arbitrary to me, based on number symbolism in general, and on the initial letter of certain words in Greek. However, it is the first attempt in print to bring a hieroglyphic sense to Greek.
A new book has just come into print to add to our knowledge of the Greek Qabalah. It comes highly recommended: "The Greek Qabalah, Alphabet Mysticism and Numerology in the Ancient World", by Kieren Barry (Weiser Books, 2000).