I've reviewed upwards of 50 cars for Speedmonkey. Just recently I've started filming short video reviews on my iPhone5.
These are pretty amateur efforts and involve me jumping out of the car on a test drive and recording a 2 minute film with no editing, script or even thoughts about what to say until I say it. I just think it gives a different flavour of the car than when it's entirely composed and written, and often they are my first thoughts about it.
Some are better than others. The Mercedes CLA review was the first and the Renault Zoe the most recent.
You can find the written reviews on the road tests page.
This is a playlist of all the video reviews so far.