Life without GMail (or Google Docs, or Reader or Calendar, for that matter) would be difficult to adjust to, but for a long time I’ve wanted the ability to prioritise the inbox contents, if only to ensure that unread items (however old they are) can be forced to the top of the pile.
Well, they’ve obviously read my mind (didn’t I un-tick the ‘Share my thoughts’ privacy option? Oh well …) because I’ve just been given the Priority Inbox Beta option. First impressions are very good. You can train it to recognize what’s important (and not) to you: we’ll see how well that works out, but just having unread stuff and starred items grouped together is a tremendous plus.
Can’t think why anyone would want to use any other email system.