A Brief Guide to Aspects in Astrology-Astrology is nothing if not an entertaining geometric puzzle. Here you can get your feet wet in this angle of Astrology.
About Astrology-I really like this site, which makes effective use of hypertext. This is an extremely comprehensive resource.
adze.com-this site takes itself a little less seriously than most astrology sites. For example, it gives pointers on how to use the stars to increase the hits to your web site.
Astro-Chat-Talk about the condition of your natal chart with geeks as they gloat about theirs.
Astrology: signs, planets, house & more-contains an excellent hyperlinked breakdown of the interpretations of heavenly bodies in the various houses and heavenly bodies in the various signs. This is the first complete site of its type that I learned of. It can be used as a good second opinion for chart interpretations made in About Astrology (see above).