Recently, some photography friends discovered their photos being used for commercial purposes without their consent. Didn't even have the decency to ask! Worse, the thieves erased/edited out the small watermarks, then used the photos as their own to promote their business. Geez, some people huh! Well, there's no way they can remove a big ugly watermark like this. :D Think I'll do this for all photos posted to my blog too.
Yes the watermark’s big, ugly and way too conspicuous but that’s the idea. The other alternative is to post super tiny 240x180 thumbnails as the only size available. Personally I’d rather a big watermark with opacity adjusted to about 30-40% over a web-sized (480x320 to 640x480) photo than tiny thumbnails not worth squinting at.