goth/rock? I don't think so. Definitely trip-hop. Yeah, sure, they are dark and gloomy at times, but...have (whoever entered the data into cddb) even heard any real goth? Or trip-hop for that matter? I doubt it.
Two bands, offhand, that sorta sound like Portishead are Lamb and Halou. I totally dig the most recent albums from both of these bands (What Sound and Wiser, respectively). But I agree, they are sorta unique.
Someone please watch the DVD and tell me if it's worth buying.