I think that if you want calibrated temperature readings, you need to use an offset value for each individual sensor. I think that the 'standard' sensor is not calibrated for an offset, so it will read consistently for itself within 0.5 degrees as per spec, but the reading is not guaranteed to be within a certain deviation from a standard temperature. So sensors from different manufacturing batches would maybe all read the same, but not the same as a different batch.
self-heating up to 2-Celsius and rising.
That sounds more like user-abuse, and I suspect that, if it was even faintly true, Maxim would have gone out of business long ago, and nobody would be talking about DS18B20s today.
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