Watermarks
Watermarks on the other hand, I cannot effing stand! Honestly, you think someone's going to steal your picture of an escalator? Take a moment, step back, and realize you're not God's gift to photography. It ruins the picture anyways! I think it is incredibly pretentious.
... "effing??" I guess one of my peeves is people not saying what they really mean...
However, for you to think putting a watermark on a photo somehow implies someone thinks they're "God's gift to photography" is a bit short-sighted. Obviously in the amateur world... who friggin' cares, right (okay, guilty of not saying what I really mean, also.) People give their stuff away happily. But if someone wants to put a watermark on their photo, that's really their choice... you don't have to like it, as you might not like pictures of babies or flowers, but let's not be judgmental about why they do it. Maybe there is a valid reason... it might even be just to tick you off, but I doubt most watermarkers really can be bothered with that reason. More likely it's to discourage false crediting of their shot in this day of re-blogging with the likes of tumblr.com.
I think it's a personal choice.
For instance, I don't watermark small images that I contribute to these types of forums, which are fairly anonymous (even though my website is right there in my signature) and really just about sharing images.
On the other hand, when I post images to a forum that may be seen by potential clients or that are about posting a body of professional work, I definitely watermark. It's not about image theft; it's about branding. Oh, and any time that full-sized images are available, I watermark (though that's not very common).
All the shots I post here are linked from another gallery that is viewed by potential buyers of my images, so I watermark. As Edge100 states clearly, it's not so much about theft as it's about branding and name recognition within the fairly small world of photographers and clients some of us live in. I do think watermarking should be fairly innocuous to the image, but some genres of photos dealing with extreme sports and other things are commonly abused by the very market one is serving, unless the watermark makes the image practically useless -- not pretty, but effective in a catalog sales gallery. And finally, there's the issue of simple identity of the photographer... why do painters sign their work? Why do artists sign their limited edition prints? Why do posters here have sigs under their posts? It's a way of identifying ourselves somehow as unique individuals, and in the end it all goes back to ego, somehow. Healthy amounts of ego are vital for success, but too much, too little, or a false ego entirely... tends to reflect itself as strong judgement of others.
Doylem... see what you started.