Okay, I keep getting asked about this.
I didn't make this program and I don't take any credit for it, which is why I'm linking to the original post instead of to the download itself.
http://www.ppcgeeks.com/help-unlocki...,60.html#66905
It was a program that HTC originally released on the Titan update. Its essentially a keygen that calculates what the SPC/MSL should be from the hexadecimal ESN.
It was turned into a program that dumps the SPC/MSL and then ported also to run on WM5.
It only works on HTC devices but it gives you your code in no time.
Enter it in all caps to get the correct code.