iOS: Most to-do apps are full of things that we have to force ourselves to do. TaskCurrent is an iPhone and iPad app that turns your to-do list into a list of skills to learn, motivational tricks, productivity tips to work into your day-to-day life and more. So while the app models itself after a to-do list, it's the kind you'll actually want to use every day.
The app is completely free, and once installed you can browse the categories of "currents", essentially tutorial series and regular tips you can subscribe to. For example, if you're interested in learning about new coffee drinks, the "Coffee Drinks Galore!" current is a weekly "to-do" that's added to your list of new and unusual drinks to try at your favourite cafe or prepare at home. The productivity section even has a daily series of motivational tricks by Leo Babauta, author of the blog Zen Habits.
Right now, all of the streams in the "stream store" are free, but it's likely that the developers behind the app are planning to offer paid streams in the future. You can connect TaskCurrent to your Facebook account to share your new skills and what you've learned with your friends, but it's not required.
TaskCurrent requires iOS 5 or later, and is available now in the iTunes App store for both iPhone and iPad.