Thanks to Allison for pointing out this "short screen cast explaining how to separate or merge PDF files with Preview" (Technology Integration) in the EdTechTalk group.
"Want an easy way to share a bunch of URLs? Simply list down all the URLs you want to share in the box below (one link per line, including http://) and we will create a single link to share."
Reviewed by Amit Agwaral at Digital Inspiration.