Expanding ads
These expanding "content breaks", the EMC one in particular are about to drive me away from El-Reg. Article pages loads but as soon as I start to scroll (using wheel), the add expands. The ad then scrolls rather than the page until eventually I get to the rest of the article. With the EMC ad in particular, it's often longer than the article itself and you I completely lose any continuity.
Reading El-Reg is now an exercise in frustration and I don't need more of that in my life.