Things 2 and Things Cloud
One of the better looking To Do/Getting Things Done apps out there, Things 2.0 ($49.99 in the Mac App Store, $9.99 for the iPhone, $19.99 for iPad) is now available and, some might say, finally has Cloud syncing.
Things Cloud stores your to-dos and automatically keeps them updated across all your devices. All you have to do is turn it on in the Settings and create a free Things Cloud account. It’s that simple.