Yes I ran into that too, as I reported elsewhere - the family code for the 18B20 is different from that for the 18S20. (There's a note one the Arduino OneWire page that mentions this.) Just replace the family code in the test (0x28) with the one for the 18B20 (0x10). For the record, the DS1822 thermometer has yet another family code (0x22).
Awesome, Thanks, I must have missed the family code changed, I thought I read all the paged, my bad.
edit: Its working now, I am getting hex data out, which is great. I saw this piece of code in the original code snip, I just want to make sure its an accurate conversion of the hex
Serial.print("read scratchpad ");
msb = pad[1];
lsb = pad[0];
if (msb <= 0x80)lsb = lsb/2;
msb = msb & 0x80;
if (msb >=0x80) lsb = (~lsb)+1;
if (msb >=0x80) lsb = lsb/2;
if (msb >=0x80) lsb = ((-1)*lsb);
Serial.print("T = ");
Serial.print(lsb);
Serial.print(" ");