They say that “Imitation is the sincerest form of flattery.” Not if you are a Web site owner and you have a brand to protect, however!
I’ve seen designs copied, content copied, even entire sites copied. It’s so easy for infringers to “View Source” and take whatever they like, without regard to copyright.
You can locate copyright infringers pretty easily with Copyscape if they’ve lifted some of your page copy. It’s much more difficult if they’ve limited their sticky fingers to just your design.