The Library of Congress has a great site: www.loc.gov/topics/hispanicheritage
The National Education Association:
Hispanic Heritage Month on Biography.com
Nordstrom (one of my favorite stores) is also doing its own thing: Extranews.net Check it out here: www.nordstrom.com/hispanicheritagemonth.com.
In terms of books, take a look ’08 Hispanic Heritage Month Reading List from publishers.org.
Hachette Book Group USA is getting in on the action and helping bloggers celebrate with good books too!