I chucked my iPhone (becasue it was no good as a phone, no matter how great it was in other aspects) and bought E51. I am extremely happy with it. Actually, it is such a nice pack of features disguised in such an understated form.
It works very well as a phone, good battery life (about 2-3 days for me), all connectivity options including Wifi and 3G, camera, mp3, MicroSD support upto 4GB, USB interface, Nokia s/w suite to do backup and firmware updates...A nice leather pouch..what else could you possibility need from a phone ? And all of it at a neat price.
It is quite sturdy too. It fell from my hands a couple of time, but not even a scratch.
One could complain about the camera. It is only 2 mega pixels. But then, if you are serious about photos, you will carry a camera around. So, I don’t really care.
I think this is easily the best valuable for money phone.