How can I “embed” my application into the windows taskbar (not the systray) like in the picture below?
I would like to create a quick application that embeds into the taskbar.

(source: osirisdevelopment.com)
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This is called a Desk Band
There is an MSDN article explaining through the link.
There is also some previously written source code, originally on code project but now appears to have been taken down, there is a download link here
I cant garuntee anything on this source I have not downloaded it, its your call but will hopefully be of use.
Hope it helps 🙂