Hmm... extra markup is a sure-fire way as always.

In IE7 there's still the border being overlapped by the Read More and Comments buttons (the ".end" class).

It looks like Garrett used this, which is supposed to do the same trick:

* html .clearfix {
height: 1%;
}

But the * html only targets IE6 and below, not IE7. So don't use my code you can just remove the * html part from this. It should fix both of the problems.

btw after changing CSS remember to refresh the page.