Interesting thread! I'll throw in my two cents worth to this one as well.
I've spent a long time studying / reading / meditating on / contemplating / etc over the last two years on the life / death / rebirth cycle that happens to Man. One of these aspects is of course astrology, but not specifically as a divination tool but rather the aspect of how it influences us as a process of our own creation / reincarnation.
In some of the teachings I have read there is a great explanation for why people match their sun and moon signs so strongly... which I throw out here for the greater analysis... it certainly rings true with me.
In my understanding of greater human consciousness we have four bodies... the physical, the etheric (lifeforce), the astral (thought and emotion) and the higher self (which I refer to Ego with a capital 'e' to represent the perfect divine spark that all of us have). The physical and etheric are called the Lower Complex and the Astral and Ego the Upper Complex. Anastasia certainly refers to the Upper Complex often in her teachings (e.g. see p5 of Book 4) and from personal experience I know they exist. I have an article a wrote on this here
http://www.revelationsky.org.au/Revelation-Sky-Subtle-Bodies.html.
At the moment of conception a new human soul begins its incarnation process. Initially the developing fetus is only physical and etheric, the upper complex is not there yet. After about three months the upper complex begins its decent into the body... traveling as it goes through the immediate astral environment of the earth and gathering up astral material with which to create a new astral body for the fetus.
It is said that the planets are a reflection of a greater spiritual reality and that what we see is actually an embodiment of a particular group of like-minded energies (Anastasia talks about grouped energies like this on p8 of Book 4)... thus it is common practice to see Mars as aggression / war / activity, Saturn as being melancholy, thoughtful, etc.
So... as the Upper Complex descends it passes through the astral layers represented by these planets. Depending on their relationship to each other at the moment the incarnating soul passes it gathers up different "flavours" of astral material. As the astral is where our personality resides, this in turn influences our behaviours on earth.
There is much more to this I could go on about... but what do you think?