One of the coolest but least mentioned features on BlackBerry OS 10.1 (and some older builds) is the two way remote file access built into BlackBerry Link. If you have BlackBerry Link installed on your desktop and associated with your BlackBerry 10 device you can access files both way. So far I have found this very useful for copying pictures off of my BlackBerry Z30 without plugging in any cables as long as I am on the same wireless network. Better yet if you open the file manager on your BlackBerry 10 device you will also notice that you can access certain folders and file on your desktop from your phone! Its pretty awesome and even works over your cellular connection.
There are some default folders shared from your desktop to your phone but you can add any folders you wish. The BlackBerry HelpBlog was kind enough to put together a video showing off the feature:
Now if BlackBerry would just let us mount network drives from our devices I would be really happy!