I use Opera, left-click=same tab right-click=new tab. I prefer having the control rather than pages opening a new tab by default. Sometimes, I'm through with the page and want to open the new content in place, other times, I want to leave the current page/tab open and have the link open in a new tab. IE & FireFox offer the same functionality so personally, I'm not sure why a change is needed.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken