These sort of product celebrations (with users providing feedback on what the product means to them) are fantastic. As a user it's great to be able to see what a product means to others too and how they're using it. We had a similar page for a website we run and reading user feedback is so much fun, companies should do this sort of thing more often.

Trello only reached 500,000 users in July of this year, that's some spectacular growth: http://blog.trello.com/trello-is-now-500000-strong/