AbigailII: But it is. Defining it in the stylesheet, by no means overrides the default settings browsers have of underlining it or whatever. But if a user disables that default, suddenly the site doesn't show any links (I know many people who actually do this - Google, for instance looks so much cleaner without all those underlines...).

And anyway, it is already imposing. On the left menu all my links show up underlined (using browser's defaults). On the right none of them do, because the corresponding style specified text-decoration:none. Adding a a{text-decoration:underline;} rule (or color:blue; or whatever) would keep the links on the right menu still not underlined but would make sure links in the middle of a post somehwere do not go by unnoticed...