We got tired of having to hook up a screen the Raspberry Pi just to find out its IP address, so we decided to write this simple script. Basically, you tell your Pi to send its local IP address here every time it boots, then you visit this site on your main computer to view it.
Just run the following code on your Raspberry Pi's command line:
wget http://pip.sheacob.com/pipinstall.py && chmod +x pipinstall.py && sudo ./pipinstall.py
The next time you reboot your Pi, visit pip.sheacob.com and its local IP address should appear. If it doesn't appear, you'll need to double-check some things: