Sheepwalk Electronics now has available the SWE2 module which is designed to allow easy connection of multiple DS18B20 temperature sensors to your 1-Wire network without any soldering or wiring required. It is available as either a bare PCB, kit of parts or an assembled module. It is also available in assembled form complete with four SWE0 temperature sensors at a discounted price over buying the bits separately.
One place where this module could be ideal is, for example, in your airing cupboard where the four sockets for SWE0 sensors could be used to monitor water tank temperatures and/or pipe temperatures. I have one myself in that situation measuring the tank top and bottom temperatures and the pipes at either end of the main heating coil so I can monitor how my wood burner and back boiler are working.
For more information on the SWE2 module, see http://www.sheepwalkelectronics.co.uk/SWE2.shtml