If you have a website you may put up materials for use by teachers in classrooms. Doing this is an added incentive for teachers to use your books, and to recommend them to other teachers. A word of advice--not every teacher has the same version of Microsoft Word as the one you used in creating your worksheets. If you put up a document on your site that was created in Vista, and the teacher is using XP, she may not be able to open the document. The solution is to put your document in PDF format.
PDF? Doesn't that require costly software? It could, or, you could use the Open Office suite I mentioned last week. Open Office Writer software enables you to save a document in PDF format.
If you don't want to download the whole shebang, you can go to this site, CutePDF. Click on the CutePDF Writer (Freeware) to download a PDF program for free.
The teacher who wants to download your teacher resources can now do so. Undoubtedly she already has Adobe Reader on her computer. If you wish, you could put a link on your site to Adobe just to be on the safe side.
One more thing, if you're putting your worksheets online, for goodness sake, make sure you give yourself credit!