Whilst browsing for a G19 plugin and some SDK info, I noticed that a jobs for programmers board was offering $500+ for someone to write and maintain such a plugin.

Quote:

TeamSpeak is a popular VoIP solution. The TeamSpeak 3 client can be expanded by plugins written in C/C++. An existing plugin provides support for the Logitech G15 keyboard to display the TeamSpeak 3 client state in the G15 keyboard display, a popular feature for users playing fullscreen games with the TeamSpeak 3 client running in the background. The plugin is implemented in C using the Logitech applet SDK, TeamSpeak 3 plugin SDK and Win32 API. While TeamSpeak 3 is a cross-platform solution, the G15 plugin is Windows specific.

Etc Etc Etc.

http://www.odesk.com/jobs/Expanding-the-TeamSpeak-3-G15%2FG19-plugin_~~4292d80f0e743e40?source=rss

Maybe it's the TS3 team, too busy to do it themselves. Maybe it's a games company looking for a quick solution.
(Seems unlikely, most programmers at proper games companies can churn apps like this out in a day or two. Especially with the Logitech SDK being out there for free and the TeamSpeak 3 plugin SDK being the same.)

Click the link above and you'll also see that below it is similar job postings (g15/g19) for more cash.

tbh the Teamspeak group promise that TS3 will come with a native G15/G19 client on launch (bearing in mind we're using the Beta at the moment). At the same time, it's a pain that noone's released a decent one yet.

And yes, it is developed in Germany.

Have your looked in the TeamSpeak options for plugins?

The default installation included a G15 plugin which, according to someone on the teamspeak.com forums, works on a basic level with the G19.

TeamSpeak 3 SDK plus unofficial G19 SDK or the official one from your installation folder: C:\Program Files\Logitech\GamePanel Software\LCD Manager\SDK = have a go at making your own?

I'd have a go at retrieving and displaying simple info from TS3 but I have no way of testing if it'll display. Maybe there's a G19 emulator?