So, I've been digging into this Image Watermarking thing, and I've put together a list of some really cool Image Watermarking APIs and who provides them. I took into account stuff like how how customization they provide, the kind of support they offer, input and output formats, and more. (By the way, even though I'm part of one of these providers, I did my best to stay neutral :)
Now, these recommendations are based on my own research and what I've seen. Are there any plugins that do the same thing? Have you ever tried out any other providers? I'd love to hear about your experiences with them.