iOS: Previously mentioned collaboration tool Asana made waves when it launched, but at the time it was missing support for mobile devices. Now, anyone with an iOS device can log in to their Asana account on the go, check in on their projects and activities, comment on tasks, and more.
When Asana launched, one of the features many people wanted was some way to access their accounts and to-dos on the go. The developers heard those pleas, and the new Asana iPhone app allows you to see your projects, upcoming to-dos, repeating tasks, and other items in the same, multi-layered view that makes the webapp popular.
You can mark items as complete, comment on items, and while you can create tasks, they automatically get assigned to you, and you can change them on the web later. You can't reassign tasks in the mobile app either, but the developers note that they're working hard on the app, and right now they just wanted to give iPhone users a way to get into their accounts on the go.
Asana has updated several times since we looked at it last, so if you haven't tried it recently, it may be worth another look, specially if you have an iPhone or iPad and want to keep up with your to-dos on the go. The app is free in the iTunes App Store.