Just finished reading the paper. You have some very, very good ideas. One thing I will mention, is I encourage you to carefully consider the benefits of merged mining with Bitcoin before discarding the idea.
Namespaces-- It might be a good idea to have namespaces and allow for sub-namespaces. This way you could have one namespace per "service" (Tor, I2P, a new service in direct competition with ICANN addresses, etc), and then each service can have sub-namespaces which would be analogous with the TLDs we currently have with ICANN.
I think mergerd mining with Litecoin CPU mining would be a better idea then your not competing against anyone for users as there is no merged mining for CPU mining yet. So you would attract probally all or most Litecoin miners.