Federico Viticci posts a brief overview on the update to Checkmark, which was released about a week ago.
While I had purchased Checkmark for the iPhone when it initially launched, I never really used it. However, I'm finally attempting to scratch a particular itch that I had been meaning to scratch for a while — and using Checkmark is one of the options that I had been considering.
As Federico pointed out in his post, now is a good time to start playing around with the app.