A fellow homeschooling mom recommended the website, Homeschool Share, to me.
Let me pass on the recommendation that you go to this site! There is a wealth of information, resources, and links.
If you are using any volume of Five in a Row, then you'll be interested in the FIAR resource section.
The unit study section is another favorite of mine! Just click on the age you are teaching and go to a list of literature titles appropriate for that age group. Click on a title and you are given an entire unit study, complete with links, worksheets, and extensions.
Take some time to explore the site. We have found it quite useful this year. In fact, as I sit at this machine, I am using this site to plan a study on Curious George next week.