jQuery plugin code review

jQuery plugin code review

I'm looking for a code review of this plugin:

http://github.com/webandy/jquery-tweets

Goals:
1) testable
2) idiomatic javascript
3) flexible pattern I can reapply

I extracted an object and wrote tests against it with Qunit. I like this but now there is a TweetsPlugin global object so I'm looking for help on how to put this into the plugin namespace and still have it be accessible to the qunit test code.

I am aiming to develop a repeatable pattern I can apply to a number of other internal jquery plugins to make them more testable and better organized and maintainable.  Thanks!