this for bloggers ...here is the situation: you are buying pr4+ linkback( follow) ,or someone is giving you free linkback (follow) which one you will choose from below: 1:link + anchor (typical) . <a href="http://%%%%.com/" target="_blank" title="%%%%'s blog">%%%%</a> 2: link + image+ title (tooltip) +image alt. <a href="http://%%%%.com/" target="_blank" title="%%%%'s blog"><img border="0" src="http://www.$$$$.com/images/$$$.jpg" width="00" height="00" alt="%%%%'s blog" /></a> of course you submit your image! is it true that most think there is difference?
Well I dont really know the correct answer in terms of SEO, but I do know that it is way easier to get traffic from google images. About 40% of my traffic comes from google images, because I post images in my posts. So if I were to choose, I would have an image instead of just a link. But thats just my opinion. Hope it helps