I really don't like to superpose a copyright logo or any other text across my photos. And I generally don't like all the different types of frames various software tools let you add to a photo. But I recognize the need to visually protect your work besides adding copyright information into the EXIF data, and at the same time promote your name and portfolio.
So I've designed a compromise - adding a standard black frame and my name in RED and url in WHITE separated by a GREY square. I have not added a (C) in front of my name. Adding my name and URL implies that this photo is protected by a copyright (still part of the EXIF-data).
What do you think? Does it ruin the photo?