as long as they aren't cydoor, or doubleclick ads or full of javascript, i see no problem with ads (unless it downloads a new one everytime you touch your mouse, like morpheus did)
I did notice that ads come up on search menus, will the ads target the search? if i search for cher, will i get an ad for shampoo to go with it?
But i'll live with it, hell i plan on clicking on a few every day