From Effective UI:

The point of software isn’t necessarily to engross your users in the experience of using the software, it is to keep them focused on the ultimate goals they’re trying to accomplish in using the software, rather than on the actual use of the software itself. […] To be truly and unobtrusively useful, software must clear the straightest, most frictionless path to the accomplishment of the user’s goals.

Effective UI is a very good book, one of the few instances where a discussion of UI (or UX, “user experience”) doesn’t drive me up a wall. This is…