I'll just second what walconst, tombot, babaoriley, and others have already said. Andrea definitely took ownership of the phrase and used it to sign off her posts but the origin was from POET.
Here is the news release that walconst posted in part where the "Powered By POET" tagline is used.
http://www.poet-technologies.com/poet-technologies-special-strategic-committee-announces-key-updates/
And here is the first post by Andrea that was signed off using "Powered By POET", notably later on the same day as the news release.
http://agoracom.com/ir/POETTechnologies/forums/discussion/topics/589998-fabless-designer/messages/1851497#message
By the number of thumb's up that your query has received, leaf 67, I gather that there is still some question about the origin of the phrase that POET is using. If anyone wants to know for sure just start looking. The answer is there to be found.
This is the history of POET. Let's get it right.
GLTA,
Green
