Task management: Toodledo
There are various arguments against the whole concept of a "to do" list, and some are pretty persuasive. Still, if I don't have tasks written down and in a place I can find easily, I will forget them. For this, I use Toodledo.
There are a variety of to do list apps, of course. I don't classify things much, I don't have levels of criticality, and I like things simple. I like opening up my phone and seeing what things I decided (at some point) needed doing. By me.
I am a big fan of David Allen's Getting Things Done, like a lot of people. I'm not going to go into it, but I like it because it is simple, doesn't require a lot of upfront classification, and really does work, if you do it (the weekly review is my big weakness, again, like a lot of people). Toodledo allows me to label things as Next Action, and that's pretty much all I need.
Not that I don't have a lot of overdue tasks. But I can look and see what I haven't done. As long as I haven't gone crazy and added a huge number of overambitious projects (which I, like all those other people, have done), it is clear, workable, and always with me.