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The simplest way I know to do so--and keep a clickable link--is to use javascript to split the address in pieces and "reassemble" it with document.write for the web page. I don't know if [orperhaps better which!] spiders have figured out how to read that, but it provides at least a little bit of protection.
Yes. this question should be answered first. If you neither want people nor spiders to follow the links, then who else but you should/could use that link? and if it's only you, then the easiest way would probably be to link to an (intermediate) password-protected page.
By the way I don't think it is a good idea to post this question in three threads at the same time.