I'd prefer to have my communications centralised in Empathy. Is it possible to see my Skype contacts in Empathy and use voice, video or chat?
Yes, it should be possible, but Skype must run in background and use two bridges:
I personally use only the second one.
The Empathy/libpurple bridge is provided by telepathy-haze
The libpurple/Skype bridge is provided by the pidgin-skype