Recently I have been listening a bit the the new Kernel Panic podcast show. One of the show’s hosts is @GGlick whom I had some intriguing debates with at Twitter. It’s a bit weird because it is very much an Apple fanboy show and I certainly don’t consider myself one. But on the other hand, widening one’s horizon is a good thing. For example, they mentioned the iPhone App “Things” which I promptly checked out. And I must say, even it was one of the most expensive App I’ve got, it was a very sound investment!
It’s basically a very simple to-do list app. The unique thing about it is that it is based on the “Getting Things Done” organizational method. And even though I’ve never read anything about GTD, using Things I immediately see the advantage. You have things like the Inbox which is a place for you to randomly drop in tasks you just remembered you need to do but don’t have a clue when. You can then later on go through them like through you E-Mail inbox to figure out how to deal with them.
But what really makes this a very effective tool is the Today list. You can mark certain items as things you want to do today. They will then appear prominently in the App itself but also as a small number at the icon of the App. So you are constantly reminded of the things you wanted to do, but only of the things you really CAN do. Tasks, which aren’t important today are stored elsewhere so they don’t bother you as much anymore.
Finally, if you check a task, it doesn’t just disappear or something. It remains in the list for a day but checked-out to give you the good feeling that you’ve managed to get some stuff done. It is being moved to a history folder at the end of the day.
I just started using it but so far I love it. I will keep you posted if I stick with it… and that’s another task checked-out 
There’s a pretty good version of this for Android phones too, called Astrid. It’s reduced my collection of yellow post-it notes significantly.