Fresh Content
http://www.freshcontent.net/directory/news_feeds.html
This site comes highly recommended. At last check there were 84 categories of news feeds available with no registration. All feeds use javascript so installation is a snap. A sample feed is provided with each category, so you can see what type of information is provided with each.

Free Christian Content
http://www.freechristiancontent.org/
Designed to assist Christian webmasters in finding suitable content for their website.

The All I Need
http://www.theallineed.com/webmasters/index.htm
I would be interested in getting some feedback on this site. Seems to have some useful tools and articles.

Website 101
http://website101.com/freecontent.html
Free website and newsletter content offering 150 articles about business and marketing on the internet.

Dating Soft
http://www.datingsoft.com/
Add online dating personals to your site. This looks to be a revenue earning opportunity that pays you for referrals (new members). Details are provided.

eNature
http://www.enature.com/free/free_content.asp
Display plant and animal pop-up cards on your site. Each card provides an image of the plant or animal along with it's description and/or history. Each pop-up card opens in a new window so visitors stay on your site. A ton of categories to choose from.

Spanish Word of the Day
http://www.donquijote.org/linkus/
Place the Spanish Word of the Day or Lesson of the Week on your site with a few lines of javascript. Great content for Spanish language sites.  

RCUniverse
http://www.rcuniverse.com/community/rcufreecontent.cfm
This website features radio-controlled cars, airplanes, helicopters, etc. The free content they offer revolves around that area and includes classifieds, events, articles and forums. An affiliate program is also available. If you have a website directed towards the hobbyist then you will want to review this one.

WeLoveFreebies
http://www.welovefreebies.com/freecontent.php
A daily updated list of free offers.

Journalism.UK
http://www.journalism.co.uk/news/story1616.shtml
Add Journalism.UK news or job listings to your site.