FLASH for Olympus EP-2
I use a Nikon SB 16 which I picked up for $20. It works in manual mode just fine and comes with a flash guide on the back so you can calculate your flash manually. With a little bit of practice I've gotten good results. I also picked up a little Olympus TL 20, made for the OM film cameras way back, and again, using it manually...it's a pretty good flash too, surprisingly powerful for such a small unit. I basically got it for free and I pop it into my small camera bag just in case I need some simple flash requirements. Any of the big Nikon guns should work for you.