Now that Twitter Tools is at 2.x, Alex has provided an API for enabling additional posting.
So I wrote a plugin for his plugin: Twitter Tools – StatusNet.
It leverages the API he provided to post your tweets (on new blog post creation or via the sidebar form) to a StatusNet instance (default is Identi.ca but it can be easily changed to another). (In case you missed the announcement, the software formerly known as Laconica, which powers Identi.ca but also other sites, is now known as StatusNet).
Given that many StatusNet instances also already cross-post to Twitter, my plugin enables you to suppress the actual posting to Twitter that Twitter Tools does. (You can have notices posted to both Twitter and your StatusNet instance, or just your StatusNet instance without Twitter).
What it doesn’t do is provide all the functionality Twitter Tools provides – digests of your notices, a sidebar widget containing latest notices. If you cross-post to twitter you can use all that functionality from Twitter Tools natively.
If you’d like to replace Twitter throughout Twitter Tools with your favorite StatusNet instance, you can hack away at Alex’s plugin directly – the same basic concepts I outlined before would still apply.