lol no panic !!
I'm not sure how ebay uses its keywords to ensure the right sellers appear in a results page or how you can cover all odds of phrases customers may use when looking for your category of resources.
![Dizzy](images/smilies/dizzy.gif)
they may have some information on there to help maximise your copy text !?
You could also make a small feature on the front of your webpage alerting readers to what you have to offer ..& maybe pull out a few bits from your December planning to demonstrate the sort of things that are inside the books, have you a scanner that you can use to digitise some of the childrens work & display it on your website ?