There is one feature that trumps them all. It seems small, and likely went un-advertised, un-marketed, and the engineer who included it likely didn't even get an extra IZZE at the one-infinite-loop café that day. This feature, however, affects something that I use all day, everyday, and cuts the time it takes to do this task by about 90%. It affects one of the most important things in a professional person's life, and it makes it 90% more efficient. Seriously.

I'm not talking about the stuff they advertise; that stuff is cool, and yes, it does help... but honestly, syncing my mobile calendars, making 10-minute-blogs, and sharing photos doesn't really affect my life all that much, and it certainly doesn't make me better at my job.

The new Mac POP email client v. 4.3 that comes for free with your new Snow Leopard OS.... with one click...

This may actually run on magic, I'm not sure, but this simple feature is the single most useful improvement to computers that I can think of. Address, phone numbers, emails, no matter how the person formats them, file neatly, and automatically into the proper fields in the Mac addybook. 

So here's to you, un-named Apple engineer. You've changed my life, and all you got was an overpriced apartment in Cupertino.