I can see this working with 'trusted' areas.. of course it's a bad idea in a coffee shop or office with lots of people you don't trust.. but at home or your own office this can be really time saver.
I just don't see how, if it's a 'trusted area' you don't usually lock your screen (or maybe you do? I imagine most people don't though), which means if you're logging back in, it's because you've been away for a bit.
In which case, your machine may also be hibernating, which is slow to being with. So something like automatically unlocking while your phone is around isn't really all that useful.
Not to mention, how long does it take to type in a password?
You got me thinking... Combine this with something similar to Tasker, so it only works when you're in trusted areas (Office, Home - Not coffee shops, etc...)... This could also increase security if somebody was to somehow steal both your laptop and your phone...
On a tangent, I'm really excited about this and hope there's a Windows+Android version on the way (or clone)...
