Actually Gav, my interpretation of the ribnet rules is that you can put your website address in your signature - so long as you are not actively
touting for business without being a trade member, see: Guidelines for commercial posting
However on the splashing issue - it has been discussed to death here in the past. I don't think Nos was necessarily condoning it, but the original questioner clearly recognised that this was an issue and simply wanted to know if the boats were actually any good - regardless of the origins of the design.
If someones intellectual property rights have been infringed then there are correct and appropriate routes for redress (ranting on the web is not one of them!). If the intellectual property is not protected (or properly protected) then it is actually quite legitiamite (legally) for someone to clone them.