DV2 is great !!!
I ordered a DV2 the day it came out and I love it. I travel a great deal and the DV2 is perfect - I had a netbook but it was just too underpowered even though the size was great. I also have a core duo 14" notebook. I like the power and speed but not the weight or size for travel. The DV2 is a great compromise. Not the most powerful but powerful enough and not the smallest or lightest but small and light enough.
As far as heat from the DV2 is concerned, I just returned from Phoenix,USA ( American Southwest ). In the two days I was there the temperature was 105F and 103F respectively. To put it another way - THE WHOLE WORLD was as hot as the exhaust from the DV2. People live, work and love in that heat. I use my DV2 on my lap all of the time in airports and hotel lobbies with no problem.
Battery life is good enough for me but I concede it may not be enough for some. Most airports have charging stations now so about the only place I run on battery power anymore is on the plane. I don't play movies but in just ordinary use I would agree with the Register review that the battery would last about 3 hours or so. I have used it over 2 hours with no problem. Turning off the WiFi helps.
One last note, I have used HP extensively for 30 years. Overall their quality is the best.