These are links to sites that offer free (or almost free) ways for you to add dynamic or interactive content to your site.
Web Cards Maker
Free web card makers for your site and a ton of other services.
Free Recipe of the Day
Several types of recipes to choose from, that you can add to your site.
Simple Machines Discussion Board
Add this robust discussion board to your site!
Post-Joint is another place to get free unique content for your blog, Post Joint connects advertisers with blog owners.