I just saw this article that I thought might be useful to some people on here, I think it provides a great summary of some tips to get tack sharp images. I think most of this stuff has probably been discussed on here before but this article sums it up nicely I think.

http://www.digital-photography-schoo...k-sharp-images

Since switching to back button focus with AI Servo focus tracking I have never looked back! The only problem lies in handing your camera over to a "layman" to take a photo, but why would you want to hand your camera over to someone else anyway