I agree, even if you get one with "smooth" edges (which I managed to get on my second round), the design is still a sharp, 90º type angle. Wasn't always this way: my old iBook is nice and rounded.
Some people have sanded or ground down the edge to make it smooth and rounded (which it did), but that entails cutting through the anodizing. There's a fellow who posted pics, etc. on his website, which I imagine you could find by Googling. He says he has had no problems, but obviously there are strong opinions about it. Be prepared.
Others have taped something over the edge....... not the most elegant
One idea I thought of was to use a hard case such as a Speck See-Thru. They have a plastic edge that comes right up to the top of the sharp edge. It is sharp too, but I wouldn't hesitate to smooth that edge off and it should not be very difficult with something like some wet-dry sandpaper. Then you would have a rounded plastic edge instead of a sharp metal one, but not have to do anything to the case of the actual computer.
At least for now, I decided I didn't want to have to add the 1# plus thickness of the hard case to my laptop, so I try to keep my arms off it, which is kind of like trying not to touch the steering wheel on your car, but until the design is changed, what can you do. Also, I had a year of practice on my plastic Macbook, which was also quite sharp (I did "ease" the edges of my brother's "Blackbook*" with very fine sandpaper, and it worked quite well, but I hadn't got around to doing mine before it died prematurely).
*not anodized though; rather, solid plastic.
Granted if you are typing at a table and with proper posture it's not a problem, but there are always those times you use the computer while lying on a couch or something. And even if you always type perfectly, I find that when I'm just web surfing -- with my right hand on the touchpad -- there's almost no way not to rest my hand/wrist on the computer (and why shouldn't I? It's a palm rest after all).
Sorry not to be more helpful. I still like the Mac better than other computers, and I pretty much have to have a laptop. That said, when there is a re-design, I hope it is more rounded. I'll be first in line to buy one, if so. This case has been around for three years or so now, so there is hope, since styles always change eventually.