GETTING STARTED IN ESOTERIC ASTROLOGY
This is one of the finest, clearest presentations of Alice Bailey's concepts presented in "Esoteric Astrology" that I've seen. It's definitely a must-read.

totse.com | The Seven Rays
An interesting presentation of the 7 rays presented by Alice A. Bailey in "Esoteric Astrology

The Soul Purpose of your Rising Sign, Part II
This article is by Alan Oken, a fine astrologer who wrote "Complete Astrology," one of my favorite references.