Cooliris is a browser extension that give you previews of links without clicking on them, by hovering the mouse pointer over the link, then moving your mouse pointer over a tiny little icon that appears when you hover the mouse over a link. It works with Internet Explorer, Firefox, and Safari.
Cooliris reduces back-and-forths that result from clicking a link and finding out that the page is unsuitable or the link broken.
To get a look at Cooliris in action, check out the animated doohickey on the Cooliris page.
I have it installed right now on Firefox. It's nifty--but is clicking a link really that much trouble?