And I don't think I've really explained the problem over here, have I? It's actually so simple, I can't believe Microsoft can't get this right. See the CSS for the div with the site contents:
div.c2 { position: absolute; top: 50px; right: 0; bottom: 120px; left: 420px; overflow: auto; }
Can you guess the problem?
Answer for the curious: For some reason completely beyond my imagination, IE apparently (still) cannot understand more than two of the top/right/bottom/left positions at the same time. Equally beyond me is the reason why it ignores right (which you don't really notice) and bottom in favor of left, which is listed last, but at least this limits noticing how bad the failure really is only to the blog page (where it proceeds to rape the layout as badly as possible, leaving you with no access to the site navigation links).