Groovy real world Half Life 2
Is 
it live or Memorex?
This guy created some amazing CGI/real-life crossover images. He says, “…and anyone with a camera and a relativly fast computer can make this.”
I almost believe him. It’s still astounding that some guy with a computer and a little drive can make these images, which are more realistic than the best movie special effects from 5 years ago.
He goes on to mention
All you need is:
A digital camera
A reflective sphere (which you see in a few photos) to capture the lighting of the real-life scene which you want to composite your model into.
A small program called HDRShop.
Big program called 3D Studio Max.
and finally you need a good renderer such as VRay.
Then of course you need the tools to get HL2 models into 3dsmax: GFScape, a HL2 Model importer, and a texuture and model converter
(He neglects to mention the approximate $5k price tage of the software, but hey)