As we were not really satisfied with the existing solutions we implemented one from scratch. Our solution is a fully jQuery UI compatible ticker plugin (also compatible with their theming framework) and fully unit tested. We didn't yet have the time to test it under every browser, so feedback is welcome (for problems please open issues on the below Github project site).
A special styled demo (Twitter like) is available here.
The main main repository can be found here (ticker branch). There are several options to customize the ticker (documentation at the above mentioned Github repository).
Screenshot:
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