Status-line crawlers are a popular toy, but they take away link information that the user may consider more important than your crawler. Some people also use JavaScript to put link descriptions in the status line when the mouse is over a link. If you have a link description that's that good, use it for the link text. Again, you're taking the URL away from the reader at exactly the moment that they're likely to be looking at the status line to see where a link is going to take them. Provide redundant navigation People learn in different ways.
People behave in different ways.
People's perceptions respond to different cues. So be good to everyone, and provide navigation that works in multiple ways. This is one of the arguments for using both image maps and text. Some people are going to use the text links, even if they are loading graphics and the image map is right there on their screen. For site maps, it helps if every page links back to the site map as well.