We've been using myregistry.com and have been perfectly happy with it. MyRegistry syncs directly with several popular registries, and lets you add anything not

We've been using myregistry.com and have been perfectly happy with it. MyRegistry syncs directly with several popular registries, and lets you add anything not in one of those stores with a bookmarklet that intelligently grabs name/price/etc. from the page you're on. It doesn't sound like this doesn't anything significantly different, other than having syncing with more stores (which is, admittedly, nice).