I just got this phone as well. I originally wanted to buy a clam shell phone (dont ask me why!!! ) but then i saw the D-500 (actually mine is the D-508 this is supposed to be an upgraded version of the original but i haveen't bothered to check what!)). Overall an excellent phone i must say. This is my first samsung phone after a long list of sony ericsson ones.
What i like about this phone is:-
Excellent clarity in voice and screen
Very large number displays when dialing a call.
Smooth slide action for handling calls or even picking or rejecting calls can be done without this above operation.
Excellent placed keys on the keypad.
Decent camera
What i dont like in this phone:-
No memory card slot hence very limited memory especially if you want to but in like a 50 songs with 8mb over.
Slightly hard to hold when slide operation not in use.
Very fragile phone. If it falls there's no coming back.
Charger has to be put into the slot very carefully + not too many people own samsung phones so just in case you leave your charger home thats it for you.
Oh yes and lastly this tiny speaker which comes with the phone. Firstly seems very fragile and while attached to your phone sticks out and makes the whole package seem even more dangerously fragile!!. Couldnt they somehow just have built this in. Half the time im losing the little thing.
Summary, overall very happy with the buy as i got it at a very decent offer price of 15k only!!!