Over the last year or two the ability to remotely access sensors and other devices over the Internet has become exponentially easier due to the rush of new Internet-of-Things platforms such as cosm, Ninja Blocks, XOBXOB and others. Another example is Exosite, another IoT platform that allows connection with various forms of hardware, and also the Arduino platform.
The team at Exosite have published some neat examples in their support section, and this includes monitoring the temperature data from a DS18B20 temperature sensor with an Ethernet-enabled Arduino and displaying the resulting data using their platfom. The code is simple thanks to their Arduno library, and useful displays can be created with the Exosite platform, for example:
If you're making your own Ethernet-enabled Arduino project - save time, space and money with the Freetronics EtherTen. Apart from being fully Arduino Uno-compatible, it has onboard Ethernet, microSD socket, full USB interface (so you don't need a costly FTDI cable just to upload a sketch!) and supports optional Power-over-Ethernet.