The International Herald Tribune Online, imo a great online newspaper, has a cool columnized article interface. The strange part is its columns flow so well: you can change the text size and the columns still flow. Anyone who's messed with HTML 4 and CSS enough to know that's impossible knows that's impossible. It's taken me a bit of fawning and poring, but I figured it out.
You can see easy proof (of sorts) in Mozilla: do a Select All and a Copy, and Paste into your text editor of choice. There will be four copies of the full article text: the original hidden copy and the three columns' cloned texts.
It's quite a neat system, but it'll be nice when you can specify in CSS the block into which to overflow and let the browser handle it.