I published Namedays application to Windows Phone Marketplace. This application show selected country's name days. Name days thought the year are visible in application and today's names are displayed in Live Tile. So it is really easy to see and remember if your friends has a name day.
There are 15 countries included: Austria, Czech, Finland, Finland Swedish, France, Germany, Hungary, Italy, Latvia, Poland, Slovak, Spain, Sweden, Uk and Usa.
Email me to get your country supported.
Here is a few screenshots: