Got my lens on Friday, and had a little play over the weekend. I am very pleased with it, it weighs less than I was expecting (I tried a 70-200 F2.8 L IS before and found that very heavy), and the AF is better than I was expecting too.
Took a few shots, but having problems trying to upload them onto my smugmug (keeps crashing firefox and IE for some reason

), but have managed to get two up, which I will share with you guys.
f2.8, 1/1250, ISO 400 @163mm, handheld grabbed shot - focus was between the two of them according to zoombrowser:
f5.6, 1/160, ISO 400 @151mm, handheld semi set up - focus on top of my dads head:
Not really trying to do much but get a feel for the lens, so mainly grabbed handheld shots, but very impressed - especially looking at the SS for the second shot - 1/160 on a 200mm lens handheld!