Crate & Barrel is a great choice for the engaged couple. They have a very easy registry system and carry almost all of the kitchen goods you may want for your home. The best part may be the ability to put their wonderful furniture on your registry (prompting folks to give you a gift certificate to put towards the rolling steamer bar).
Service is usually very good and the exchange/return process is easy. I am a big fan of their holiday items (from specialty foods to embroidered kitchen towels).