I'm a big fan of HDR photography, though I think its very easy to take the effect too far and ruin a shot - I've seen a lot of HDR pictures where the final image looks really cartoony/over processed.
Still, I guess its just down to the personal preference of the person taking the shot as to how far you take it. I did a couple of test shots on my car...
(bit grainy as the pictures were taken with a snap happy digital camera using my knee as a tripod!
)
...and I was hoping to find a decent spot to really play around with the effect, but I couldn't find anywhere local that had what I wanted - another job on my "to do" list!
You may have already seen it, but if you get a chance check out this chaps work:
http://www.flickr.com/photos/stuckincustoms/
He's recently released a book of his HDR work which I'm trying to get hold of, but some of his shots are truly stunning.