Your Android device can be transformed into GPS tracker with GPS-tracker application which can be downloaded from Android Market.

Download GPS-tracker application from Android Market;
Install and start application on your device, here you will find "IMEI" number of your device;
Create GPS-server.net account, guides are here;
Add your device to your GPS-server.net account. Enter your device "Name" and "IMEI" number, guides are here;
Make sure GPS and Internet connection is activated on device;
Start GPS-tracker application on your device;
Click on "Enable tracking";
Wait for the device to get a satellite fix, this can take some time (and is best achieved outdoors with clear sky);
After some minutes you will see location of your device;
If you want better battery life, set the tracking interval to at least 60-120 seconds.

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