tedster - 3:46 am on Dec 15, 2012 (gmt 0)
A few years ago I read a study of grade school kids learning to use the web. Almost universally, they moved the cursor around the visible page looking for hover behaviors. Since then my rule of thumb is that the more the client website needs to "hide" the links with a very subtle treatment, the more the hover behavior needs to be bold and obvious.
I'm particularly fond of hover behavior that changes the link to what a printer would call reverse text: white or near-white lettering on a dark colored background that matches or harmonizes with the colors of the site's theme.