Are you using chrome?

It could be this bug: http://code.google.com/p/chromium/issues/detail?id=65941

It works fine on Chrome 9 for Mac.

Looks like some kind of javascript based justification routine. It kicks in shortly after page load.

I read the whole thing and didn't notice there was dashes till you pointed it out. Maybe it's broken on your system in some way? Or am I just more used to seeing these in print, for whatever reason, that I no longer even notice them.

It might be a browser thing, but on my system it's way more than just for justification at the end of a line. For example, here's how the first half sentence looks to me:

I was asked in a com-ment to an-oth-er post to ex-plain why my re-ac-tion to IAP isn’t just in-dica-tive of greed on the part of pub-lish-ers...

I just checked my other browsers, and Firefox is the only one I'd want to read this in. Chrome has a problem with whatever is putting in the hyphens, and IE is using some difficult-to-read script font.

The bug report for Chrome says it's because the site is optimizing for legibility, which is really ironic.