All I can say is... Wow!
There are only a handful of instances where I think the "HDR" effect looks good, but this is definitely one of them. I've only tried to bracket shots a few times, but I haven't been able to get good looking photos out of it. Photomatrix is the predominant software (reasonably priced at $99), but even trying the demo, I have struggled to understand what the workflow is. There are a handful of open source products out there that are coming along, but they are truly in their infancy.
Definitely check out "Stuck in Customs" other work... he has some incredible stuff!