Here are some web resources on planned giving for nonprofits:

National Committee on Planned Giving: A national association for planning giving resources and professionals. Great site!

Philanthropy Journal: This document provides you with a understanding of common planned giving terms. Very helpful!

Planned Giving Today: A easy-to-read newsletter on the planned giving sector for planned giving professionals. This site also contains a library to books on charitable trusts, endowments, gift annuities.

Blackbaud White Paper on Planned Giving: Blackbaud, a company which specializes in nonprofit management software has developed this useful white paper on planned giving.

PG Calc: This planned giving consulting company provides a wonderful reading list on planned giving.