I've just added to the web a description of how to read a DS18B20 temperature sensor.
I wrote it in the context of the nuelectronics datalogging shield, but the information would be equally applicable to anyone wanting to make simple use of a few DS18B20s, even without the shield.
The approach used (give to us by nuelectronics... thank you!) is Very Simple. It uses one Arduino digital line per DS18B20... you can't run multi sensor MicroLans this way... but how many sensors do you need for many projects??