Zotero: In browser integration mean that its a single click to save citation information (and a full-text PDF if available)
...but I'm using Trello to stay on top of tasks, and my "to-read" list needs to have a presence in my "to-do" list, as Trello gives a better single view of my work than zotero.
Cards for new "to-read" articles in Trello, automatically - without cut + paste.