Olympus have now added a function which allows use of their MF lenses with IS by inputing the focal length manually. This was one of the great downsides of the 4/3 system lack of backward compatibility. All that cheap great Zuiko glass, I might have to buy one myself.
I have tried several ebay angle finders, go for the Seagull one it is made by a Chinese outfit who used to make Minolta under license.