You may have read these advocacy tips elsewhere on the forums:
- In this recent thread, several posts discuss reasons to not use the word "bored" when advocating.
- This thread suggests some words to use, rather than "gifted", when advocating.
- While in general there is good and bad in everything, a focus on negativity and disappointment may be seen as smacking the oobleck with a spoon and creating an unyielding solid... it works against advocacy.
- Focus on the positive, on the ideas set forth in the law and in school policies, and how the school can implement these to help meet your child's needs for intellectual peers and an appropriate level of academic challenge and pacing.
- Tips on preparing for a meeting.
- In addition to many helpful threads on the forums, the Davidson Database contains many articles by experts.

A few key resources:

Advocacy - Working with your child's school
http://www.davidsongifted.org/db/Articles_id_10558.aspx

Guidebook - Advocating for Exceptionally Gifted Young People (40 page printable pdf)
http://www.davidsongifted.org/db/Resources_id_14781.aspx

Helpful Advocacy Books:
Academic Advocacy for Gifted Children, by Barbara Gilman,
Re-Forming Gifted Education, by Karen B. Rogers, Ph.D.