seem like everyone have their own reason to support their brand..
for me, i m a olympus user. i need to talk something for Olympus.
First, body IS is the good things in Olympus, so that no matter what lens i use, it will hav d IS function.
Second, the olympus zuiko lens are ED lens, which will cost very expensive for canon n Nikon for the same ED lens. Whereas 1 bad things on Olympus is, it doesn't produce low cost lens like canon nikon 50mm F1.8. this is the main point i think will stop a new DSLR user to get Olympus.
Then for body's build quality wise, i believe you will get what u pay for. like 40D, D90, E30.
so dun compare with a entry-level body like E410, D60, 1000D.