eAstrolog
http://www.eastrolog.com/webmaster/request-a-code.php
Send them your website address and email and they'll send you the code. Auto updating content with some restrictions as to what type of domain the code will work on.

Horoscope.com
http://free.horoscope.com/
Horoscope.com offers a free daily horoscope that  you can easily add to your site using direct links or RSS feed, even a horoscope chat. No fees or signup, and they also have an affiliate program and licensed content.

Adze.com
http://www.adze.com/webmaster/horoscopes.htm
Add a daily updating sunsign horoscope to your website. They also provide a way to customize the content to the look and feel of your site.

LuckyFortune.com
http://www.luckyfortune.com/webmasters.html
Complete and submit their form and they will send you the code to add a daily updating horoscope to your site. According to the site you can later customize the colors and fonts.

AstrologySource.com
http://www.astrologysource.com/affiliates.html
AstrologySource.Com offers webmasters both fresh content for their websites as well as a possible revenue stream as well. A free weekly forecast is offered at no cost and it can also represents a revenue opportunity. They ask for a link back to their chartshop. By joining the affiliate program, any purchases made from the "hoplink" back to our site will earn you 50% of all sales.

Astrocenter.com
http://www.astrocenter.com/us/AffiliateForm.aspx?Af=170
Complete and submit their form and they will send you the code to add a daily updating horoscope to your site.

Easy Horoscope
http://www.easyhoroscope.com/
Free daily horoscope that you can add to your site in flash format.

Facade.com
http://www.facade.com/content/
A bunch of feeds for psyhic related content. Includes Today's Tarot, Today's I Ching, Today's Runes along with a number of different free readings. Simple javascript adds the content.