picture-shark 

Watermark and copyright picture galleries with logos and text. Wizardlike Interface. Processes hundrets of pictures each minute. Support of transparence and realtime preview. The feather feature for smart edges with one click. The best: It's free !
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PhotoWatermark Professional 

PhotoWatermark Professional combines power and ease of use, and radically simplifies the process of creating and applying watermarks to multiple files.
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Easy Watermark Creator 

Easy Watermark Creator is an easy-to-use tool for adding visible watermarks to your pictures and photos. Watermarks can contain text, images, dates, and can be solid or semi-transparent.
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