Neil: Hi @Paul. The asterisk issue is a real conundrum. We originally decided use * as a prefix in conversation URLs so that we can have both the users (http://Nurphy.com/Paul), and the conversations (http://Nurphy.com/*feedbk) at the root of the Nurphy domain name.
However, it turns out that 'auto-linking' methods across many popular sites & web technologies (Twitter, WordPress, Ruby on Rails) don't consider this to be a valid URL char, and will break a URL as soon as they hit an asterisk. This is despite the fact that http://www.w3.org/Addressing/URL/url-spec.txt suggests the * is valid and doesn't need encoding.
Do we encourage all these popular web services, clients, and technologies to fix their auto-linking methods (seems like a tall order), or do we remove the asterisk and make the best decision (considering the evidence available) on a slightly tweaked URL scheme?