A hot topic on some other forums is 'back button focusing'. All the better Canon and Nikon DSLRs have this feature, which allows pre-focusing and locking the focus with a special button on the back of the camera, reachable with your right thumb. Wish I had one of those on my GH2. But wait, I do! Except it is called the 'exposure lock' and and you have to go into the custom settings to turn on 'AF/AE Lock Hold' for this to work as a 'back button'. Then it does exactly the same thing as the button on the fancy DSLRs. Guess I'll have to try using it more and see if it is worth all the noise about it. I've always felt that half-shutter lock covered most of my needs for pre-focusing anyway.