We used Minted for Margaux's Birth Announcements, and absolutely loved the way they turned out. I like that Minted allows you to upload a spreadsheet with contacts and addresses your cards for you for free. It's super helpful and speeds up the process; which is really nice when you have a newborn! The designs are beautiful and easy to edit, and they offer free e-cards as well!
Here's a link for $25 off your Minted order - perfect for the holidays!