Interesting
I see the dangling picture effect in Firefox and IE7, so it's not attributable to IE8. If not in IE7, I'd have considered evidence that IE8 is getting closer to standards compliance; i.e., catching up to FireFox.
The problem you reported with Buck's post and the YouTube video sounds more serious, and it's IE8-specific (which makes it hard for me to debug). Script in the UI rewrites the links in a post to add the 'target' attribute to open in a new window, and so I suspect that IE8 somehow breaks the JavaScript. Oh great....