Twitter, Next ?

GigaOm had a post on a more open Twitter like universe: http://gigaom.com/2010/06/17/what-would-a-more-open-twitter-look-like/

I quite like the thought and would like to extend it

1. Use twitter's downtime to "fill transient need"
2. Support Closed communities/groups, workgroups, signed up customers. Yammer, for instance, could also support Twitter accounts with a failover option for account holders! So folks from co X, Y, Z can still communicate beyond workgroups using @twitter-id@twitter etc
3. Create add on functionality that makes it valuable for specific interests. E.g. a cycling community that also has syntax/an interface/smart parsing for logging, planning rides, in-community classifieds, etc. Some sort of an enhanced forum on the same channel ? Again, keep the links alive with Twitter and other open standards.

Some of the above do exist - but there's clearly a space for niches. Twitter has essentially helped establish a habit of and create a market for a new mode of communication on the web and mobile. The next round of innovation to piggyback on this is just waiting to happen!