Thanks, Kristine - that's a good trick. That way I can use regular expressions for all sorts of things in my posts. I might try to modify the hack so that it loads the list of expressions from an external file, so that I can reduce the risk of meddling with the code.
Ben, Mena -- would you consider adding a hook for this in a future release? You could supply an empty replacement_expressions file and reg ex-savvy users could add their entries.
I may still try my hand at a bookmarklet or something for adding Amazon associate links -- something to make it easier to link to titles
and authors, etc, etc. I'll be happy to share this if I get around to it, but I've got a lot of other stuff on my plate first

-Songdog