So, you've got a frozen pipe, do you?

Here's what to do, courtesy of the New Orleans Times-Picayune.

In case that link ever goes away, here's the TL:DR version:

1. Cut off the water supply to your home.
2. Relieve any pressure.  Open faucets connecting to the frozen pipes.
3. Warm things up, gently.  Flames or high heat can crack pipes.
4. Check for leaks.  Listen, look, etc.  Check the water meter for motion.
5. Contact a professional.  There are also temporary repair kits in the meantime.
6. Contact your homeowners insurance agency promptly.
7. Resolve to drip your pipes the next time.