blacblu:
I was planning to do a GPS tracker using the Arduino Ethernet, but the main problem is to connect the Arduino to the Internet.Was wondering what kind of modem should I use. Any tips?
Probably a GSM cellular data module, that way you can buy little pre-paid sim cards and not have to worry about cellphone contracts. I have also heard of people renting very low bandwidth (~10kbyte per second to 100kbyte per second) satellite connections for short periods of time, at low cost.