DNS updating script
This keeps my goddaddy dns @ entry pointed to my home IP.
In my crontab, I have this:
12 * * * * API_KEY=XXXX API_SECRET=XXXX /home/andrew/code/godaddy-dns/run.sh > /dev/null 2>&1
Where API_KEY and API_SECRET are provided by GoDaddy. The path to the code is specific to my machine, as well.