I have a small suggestion for the Counterparty site... when clicking on any exchanges listed there it just brings up a larger version of the site's logo, maybe have a link pointing to the respective XCP trading page instead? Just seems like it would make more sense from a usability standpoint.
I see what you mean, but do you agree that you wouldn't click to those sites there if you already knew about them?
That is, you'll probably click on an exchange that you aren't a member of, which means such users would have to (or should) check out the home page and open an account before that.
IMO while it may be useful to have another page, or a widget, with the current rate on those exchanges. That would probably provide some basic info without clicking on all the links.