Electret Mic Breakout Board Hookup Guide
Resources and Going Further
A quick Google search for "Electret Mic Breakout" will get you going for any type of project you may want to create. Here are a few of my favorites from Instructables.
If you need to add sound to your next project but need something a little more sensitive, robust or a little more useful, I recommend the SparkFun Sound Detector.
For more audio fun, check out these other great SparkFun tutorials:
Si4703 FM Radio Receiver Hookup Guide
Tsunami Hookup Guide
Noisy Cricket Stereo Amplifier - 1.5W Hookup Guide
Or check out this blog post for inspiration: