Self-developed solution that gives a hierarchical structure to to-dos, reminders, and related information:
For anything which I can't figure out a way to tie to one of my current goals, a helpful general rule of thumb is that, it may not actually be that important to hold on to. There are of course exceptions, but they're few enough that a nice folder structure on my hard drive can catch the rest.
I've been using Pinboard for a while as a bookmark list, but find the lack of any structure beyond tags a bit limiting. Just feels like I'm dumping links for the sake of it and will never really end up referring to them again.