A good on-device assistant would be super useful: - instead of searching for a setting, you just tell it to change a device setting - decent appointment/reminder setting ("remind me to invite joe to my next birthday party" -> and it knows who Joe is, and how to set up such a reminder) - all kinds of search ("what was that book about startups that someone recommended to me a year ago?", "open up a tracking page for that thing I ordered last week", "show me a photo of XX I took last summer") - managing e-mails the way old-school secretaries did - "any important messages?", or "reply to everyone I'm out of office, unless it's related to X"