Not exactly a direct quote, and I'll dig out The Magician's Nephew later and get it accurate.

Wide things in my friends' page and calendar pages screw up my formatting. It irks me, probably more than it should, but whenever I click around and everything isn't as I planned it I start getting annoyed. I'm going to have to take into account that people like to embed You Tube files without using a cut, and plan my layouts accordingly. (How wide are those things? 425? 450?) Maybe screw around with the padding and margins again? Actually, it just might be simpler to fire up Photoshop and tweak the headers. Well, that'll be later.

ETA: And done. Not exactly as it was before, but at least now embeds won't fuck with the widths.

ETA II, Electric Boogaloo: Overflow: auto is your friend.