The official TeamSpeak has a new section for Addons. Right now there is a contest to find the best plugin. So I ask you to vote for me at http://addons.teamspeak.com/directory/plugins/overlay/TS-Notifier.html. If you vote or write a review, you also can win some interesting prices.
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Does not work with the new version of TS.
I know, I hope to be able to make a new version available by this evening