So really what is the need? To me rollovers are just as bad as spash screens. As we move into a better web more and more people will be translating web pages. Image links can't be translated. Rollovers spawned the mystery meat navigation. I just don't really see the need. With CSS being able to effect states of text links I think the reason for image rollovers is diminishing.
So why keep them? What is the point? How does it enhance design?