Voice2Page - Place a widget on your blog, visitors or the blog owner can leave audio messages and listen to other audio messages. You can also leave a message by dialing a number listed on the widget. Visitors can also leave private messages to the blog owner…see this post for more of these services.
wattpad - a mobile social network based on texts, it’s kind of like a generic social blog network. Each text has a permalink, tags, votes and comments…each user has a profile of all their texts…see the latest. I suppose Loopnote, Twitter, and Jaiku are similar in there own way, in contrast these services are more about alerts/status/presence, whereas wattpad is just any old conent.
Similar networks on the web are Sponit, CommonGate, feedXS…and the citizen journalism blog networks.
UpScoop - a search engine for identities…helps you find the services/networks your friends belong to by scanning their email address via the contacts list you upload to the service. To manage you identity or various network profiles see Ziki, Lijit, ProfileLinker, SocialNetwork.In, Ozmozr, and pidy.
Profilactic - yet another meta-identity service, see above for others. One feature I do like is clippings, this is basically bookmarking all the blog posts about you (inlinks/trackbacks), at the moment I’m bookmarking all my inlinks to a social bookmark manager.
Another idea would be for it to have a similar feature to bookmark all the comments you make in the blogosphere, but I suppose you can just enter in CoComment as one of your identities.