Here are a few ideas: http://food52.com/blog...

And a few more! http://food52.com/recipes...

I used them mostly as condiments to brighten up simple vegetables( brussel sprouts , broccoli, cauliflower ) ,sauces( mayo and aioli booster) , and gravies( poultry,ham or fish) .I also slip them into some meat dishes , like grilled cedar wrapped salmon .They keep the salmon moist and impart great salty lemon flavor as the fish cooks.Once you see how versatile and lost lasting they are, you will wonder how you lived so long without knowing about preserved lemons.

Many Moroccan and other North African recipes call for preserved lemons. Check a few books by Paula Wolfert and Claudia Roden for ideas.