The Search Engine List http://www.thesearchenginelist.com/
Parts of a Web Address http://www.lib.unc.edu/instruct/community_tutorials/web/navigating/parts.html
A list of Domain Extensions (from Wikipedia) http://en.wikipedia.org/wiki/List_of_Internet_top-level_domains
Google Search Tips (from Google) http://search.ufl.edu/user_help.html