Here is a list of some of the web sites that are proudly using Poi 1.X (in no particular order):
If you do not find your site here, make sure you tell us
(use the word "Livesites" in the email subject, confirm that
you want to be listed publicly, say which version of Poi, and do not
forget to tell us the URL).
We would like to see this list grow bigger every day :-)