I recently bought the new HP dm1, btw the pictures posted by fellow forumer on the top is the older version.
IMHO the new HP dm1 looks alot better than the Asus 1215b. I've had the touch and feel of the Asus 1215b, HP dm1 built quality feels much better...the color and design of the dm1 doesn't feel overly designed it suits all type uses whether office or casual, the 1215b has chrome linings for borders of the touch pad, personally I hate chrome linings(feels cheap).
The built in speakers are well placed and nice metal mesh design with a cool "B" logo in the middle (Beats Audio), in comparison to the Asus where its speakers are designed facing the bottom of the laptop with no dedicated design for its speaker cover. Audio quality from the dm1 is really good and sharp for its size and price range.

Unlike other designs, the dm1 bottom cover to access RAM and HDD bays can be a pro and con thing, like any other laptop designs the Ram and HDD access have their own separate screw on lid/cover, DM1 has a single piece push and release cover and when removed it exposes the entire innards of the laptop, I personally prefer this design (takes some practice to remove the lid tho) the cover is flat unlike the others with vent holes


The down side dm1 screen size is smaller than the Asus, but hey.. bigger screen means higher power consumption right??
Other than the obvious stated, in my opinion for performance comparison wise there might not be or not in a huge leap be any performance difference between the two models. If ur a fan or keen to try out Fusion processors, either one will do just fine.... but I would certainly recommend HP dm1