You can talk to it from just about everywhere including the terminal, that's a big reason I use it, it acts as a clearing house for all my stuff, I even use a chrome plugin to store "bookmarks" to stuff I've clipped.
E.g. being able to make layout changes(have lists that span columns for example, or cards that show more of their information on the cover). Or more flexibility in colour changes/background, or ability to style cards.
That's the domain of photo sharing apps.
I've tried many things (including Trello) and even bought a dedicated laser printer and wrote a small shell routine so I could print 3x5 cards to keep on my physical desk. By force of habit and ease of use nothing so far has topped post it notes (other than printed 3x5s or hand written 3x5's) for keeping track of things that I need to keep on top of.