I love how @patrickrhone explains a simple habit with a lot of depth behind it:

Basically, on the front of the card I write down the tasks I’d like to get done today (and really believe I can get done).  On the back of the card, I capture any incoming tasks that pop up or things I need to write down — like a scratch pad (i.e, things that won’t get done today but I’d like to keep for some other time). As I get stuff done, I mark it done. Things that don’t get done either get moved to the next day’s list or deferred for later.

I love this idea of physically separating the tasks I’d like to get done today from any incoming tasks.

Also, kudos for using the actual × symbol in the title instead of the letter X. (Small details matter)