I remember designing a website for a well know Scottish hotel. Less than a month after it was launched some hotel had not only copied the design but all the HTML and left our company name at the top of the code!
Cool, I guess if your client felt the same way then it's up to them.
I've recently been accused of copying the design for this very site from another forum, naturally I was very offended as this design took me a long time, and a lot of work! So interested to hear how people have dealt with such issues
I think it was just a minority who felt the designs looked similar, I personally think they're very different, and Design Forums is very unique, since defending the design and showing them where my design originated (actually on a personal project for a job board - www.ukwebdesignjobs.co.uk) I haven't heard anymore from them, and I never actually received an e-mail just found the thread when checking referring sites in the stats for DF.