I've been listing several videos from The Christ Files series recently. These are found on The Christ Files website in Sydney, Australia and are extracts from a longer documentary available on DVD. A trip over to Youtube provides us with some extra footage from the series, including two extended clips of Martin Hengel:
There are several enjoyable features here, not least Hengel's self-deprecating comments on his facility in English (which is, of course, far better than all of our facility with German). Hengel died in 2009 and this may well be his last recorded interview, from 2008.
There is a first part too, but the video is not working properly (audio OK).