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Usually a physical problem with the 1-wire network. I think the most common problem I heard of is voltage is insufficient at the sensor. This should only happen with long runs or many sensors. I'm sorry I cannot provide too much more insight. The softare identifies the sensor's ID, recognizes it as a temperature sensor, and then tells it to perform a conversion. The device does not respond with the result.
Problem fixed! I quess I read the spec sheet wrong. Its seems that I had Gnd and DQ tied together and not Gnd and Power. In the old configuration the DS18s20 was recognized, so I didn't assume anything wrong with setup. A little research and bingo.
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