I've made some changes to Typekit to thicken things up. Is it better? If not, can you provide details of your OS?
Original:
I'll investigate and fix that now. What OS are you on so I can reproduce it?
It looks this this here in Firefox (http://imgur.com/WRWYzBx) and this in Chrome (http://imgur.com/6dFeQhG) on OS X, testing across multiple Macs here. I'd really like to fix it though! Thanks for the heads up!
We moved from Google Fonts to TypeKit recently, so I suspect it may have happened then.