Hi Deb,
I know of two softwares that can be used with actual content: Auto Blog Feeder and Blog Auto Poster.
Auto Blog Feeder is a WordPress plugin, extremely easy to install and use. All you do is upload your pre-written articles or posts in .txt file format and program them to be posted to your blog as you wish. It's a 3-mouse-click set up. You can read a review on my Blog, just click on my signature.
Blog Auto Poster is a more sophisticated option. Must be installed on your webserver, requires mySQL database and cron job set up. But has many more features than Auto Blog Feeder: posts to Wordpress, Blogger, LiveJournal, Movable Type, etc, does multi-category posting, imports and exports articles, manages post settings.