I have looked at several apps that work in similar ways. The big advantage I had was that the lists are "private" as well as the ability to get a private RSS f

I have looked at several apps that work in similar ways. The big advantage I had was that the lists are "private" as well as the ability to get a private RSS feeds for your list. I thought very hard about doing progressive signup, but I couldn't find a good method that didn't require a user to finish the signup on the same machine they started on. If you have any examples of sites that do this well, or at least in a way that you like, let me know!