Caffeinated Content is a great WordPress plugin for use along with your niche sites. I have been experimenting with it for several months now and just love it.
This plugin can pull content from Yahoo Answers, YouTube or Article site using the keywords you specify. This is awesome to have in your arsenal if you are having a writer's block.
I mainly use it for pulling content with Yahoo Answers. There are times I will pull in YouTube videos and possibly articles, but I mostly grab content from Y Answers.
Very nice alternative to WP-Robot and Autoblogger
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