Wireless technology from Digi International is forever changing the way that companies monitor tank levels. Using a combination of ZigBee, Cellular, Wi-Fi and wired connections, remote locations are now accessible from anywhere.
A demonstration of the SparkFun wireless bootloader using XBee and the ATmega168. Works great! You can even physically break the link and the firmware successfully uploads! It works with Arduino but not directly under the IDE.
Using a high speed PC cellular card and a Wi-Point 3G from Digi, you can create a Wi-Fi access point that allows multiple computers to connect to the internet over a single cellular connection. http://tinyurl.com/digiwipoint