The PDF file linked here for podcasting or direct reading and downloading was created in Microsoft Word and then "printing" to PDFCreator. Once it is installed you can print to it in your printer selection and it will turn your word, html, or most any file into the portable document format that can be podcast from your blog. This format will work well for posting worksheets or other documents (you could create a picture gallery using Word or other software) your audience may need to printout. Anyone wishing to see the documents will need to have the free Adobe Reader installed on their computer. 
 
Download Adobe Reader here: 
http://www.adobe.com/products/acrobat/readstep2_allversions.html 
 
The PDFCreator software can be downloaded from: 
 
http://easynews.dl.sourceforge.net/sourceforge/pdfcreator/PDFCreator-0_9_3_GPLGhostscript.exe