When I click on the confirmation link I get an empty page with "Internal Server Error", tried different browsers.
And: There is absolutely not possibility to contact anybody on the whole Trello homepage!
This happened to me, soon after I started using Trello. It turned out that they were having "a technical problem" - 15th Sept, on Twitter - and was fixed within an hour.
However, nothing on the @TrelloApp twitter stream suggests there have been any problems today.