I have been looking for info on fan forms and development of fan in Tai Chi for some time...it seems all I find is Kung Fu forms. That's not necessarily bad, but working a set that has been created to focus in Tai Chi princples would be great.
As far as the ruler, there was a good article in Tai Chi magazine, but alas, I can't find that issue. (If anyone has it, would you please post?)
I found a book reference, though. It's by Terry Dunn and called "Tai Chi Ruler: Chinese Yoga for Health and Longevity". I haven't read this one, but you might want to check it out.
Jiang Jian Ye has a great Chen walking/short staff form available through Wayfarer Publications - the guys who work with Tai Chi magazine. It is a great form (around 70 postures) and includes Chen movement and energy principles.
This past Saturday, my studio had a long staff clinic which was attended by both Kung Fu and Tai Chi students. The form we taught is a basic(generic) form, so it was very interesting to see the way each Art interprets using the weapon. The only drawback was it was over 90 degrees and we were outside on asphalt

ah, the things we do for our Art!
Cheers -
Tachi:asian: