Found this site, Pickmarkr, which offers a variety of watermark styles to brand your photographs. You supply the wording or image. You can also change the size of several photos at once. After the watermark has been placed on your photos, you can upload them to facebook, flickr, picasso or drag and drop them into a folder on your harddrive.
Picmarkr is NOT software you download, you use the mechanism right from their site. And it's fast. I have no idea why it's free and what benefit they receive. However, now, when I post pics to facebook and blogs etc.. and others use them, they will be marked and I'll get proper credit.
The only down