@ Bob

I think justin was asking about a form asking him to enter his website information while signing up to promote a product as a JV partner and i don't think he is launching the product on his own.

@Justin

You don't need a website to promote some one Else's product. You can promote through any means you want.
There are a lot of ways to promote apart from a website like social networking , PPC campaigns , lists etc.
So i don't think the product owner will want partners who will promote only through websites.

May be that product creator might have needed that information to may be give you a review copy or to know about the JV partner who is promoting that product and it might not be a mandatory field.

Thanks
Karthik Ramani