Hey, just found a bug and I thought I would report it. If you open a package in the package manager, and go to "Save To Device > My Harddrive", it starts to transfer fine and everything. While it's transfering, if you close the Package Manager, it causes the Device Explorer to throw an error.
Also, just a quick suggestion that I don't think needs a new thread:
Have it so when you go to "Save To Device > My Harddrive", it slides the Device Explorer out if it isn't already, because if not it kind of gives the effect that it isn't transferring. Thanks, Hetelek
Closing Package Manager While Transfering 
Linear Mode
