I tried my new Olympus FL50R flash today in wireless mode with the E3 and I have to say, I'm deeply surprised how effective it is. The on camera flash has to be used, though apparently it doesn't actually fire during the shutter moment, just to set up and communicate with the big off camera flash. I've yet to use it for a portrait, but indoor photos just of a room work great.
Thought I'd put up another photo from my shoot with Jasmine and her family. They were lots of fun. I didn't tell them to climb a roof, but hey if they are going to do it I'm going to photograph it!