However, two things that bothered me as a heavy Trello user:
1) I could not figure out how to move a card from one board to another. Just does not seem to be possible (yet)?
2) The drop-down in the upper right corner of a card is where I expected the close button to be, as it is for the web app. I keep tapping it over and over, expecting the card to close, but instead it shows a drop-down menu with one option: "archive"! This feels like a big UI mistake to me.
Other than that, a fantastic first release. I can't wait to walk around the office tomorrow with my iPad, tending to projects, instead of always popping open my laptop!
Also in the web app I tend to just click on the background to close a card.