It really depends on the look of the page. To me, a banner or text link has to be in the right place. Meaning it shouldn't look like it's obtrusive, out of place. It should also be noticed though. It's a tough balance. You have to test it out. Make sure that when a surfer views your site, their eyes flow well and they do see the banner, but they don't think "This is another amateur slapping banners all over the place"
good luck. Can you tell us the URL so we can see it and give you a better answer?
