clikkit - framed link browserclikkit creates a frame in the current window to display pages linked to from reddit, Hacker News, hubski, and even Google search results (experimental at this point).
clikkit works best with widescreen monitors - if you have horizontal space going unused, clikkit will take advantage of that and allow you to remain on the original website while also viewing links.
You can try out a demo without having to install anything by clicking the 'Developer website' link on the right.