Another option to integrate rendered OpenStreetMap images in a GIS desktop client or web application is to add OpenStreetMap as OGC compliant Web Map Service. For the European continent such a service is now provided by the German WhereGroup.

The service is available as a free basic WMS (GetCapabilities), updated biannually, and two commercial versions, updated daily, for specific map customization needs and high performances.
OpenStreetMap is on the way to become a serious alternative map source in professional GIS environments. The question how the professional GIS community responds to Creative Commons licensing will surely open some interesting debates anytime soon.