Links and the advent of tabbed browsers.
Tabbed browsers have made the target=_new _blank or _top style links annoying and useless. In the old days these links allowed visitors to easily return to your site after viewing a few pages of off site content. Now they are a sneaky surprise that shows up like a hand grenade for those of us that use modern tabbed browsers. There is nothing worse than a link that pops up a new window covering up my existing neatly organized tabs. After reading a few links in this new window I start creating new tabs in it. This leads to having my normal sites open multiple times. What a pain. A good link will give me enough information to decide if I want to choose to open it in a new tab or over the existing one. Having multiple browser windows open is a thing of the past.
Apologies to all of you IE users that have no clue what I’m talking about. 
It’s time.