Social Work in Aging: Internet Resources - links to organizations plus topics like Death, Caregiving and Elder Abuse.
MEDWEB - includes tables of contents for journals and links to foundations and organizations.
Seniors and Aging - this site lists organizations, plus topics like "Do We All Lose Our Minds When We Age?" or "Negative Emotions Mellow with Age."
What Practitioners Should Know about Working with Older Adults - this is a "book" from the APA.