Sooo.. The Skype have no offline messaging function due to the fact that for some reasons its servers don't bother with this, and it is unknown whether they implement it or not. But it is known that Sjype synchrinises all of the online devices. So, let's assume that we take PSP 3000, turn on the skype, plug in the power cable and leave it be. So it is always online and act as a mini-server for my conversations. Always online, always synching messages and stuff.
The question is how this stuff would route incoming calls and such, which device will ring.