You can list authorized apps and revoke authorization from Google's accounts page.

Here's the direct link: https://accounts.google.com/b/0/IssuedAuthSubTokens?hl=en

or go here: https://www.google.com/settings/ and click "Authorizing applications & sites"

thank you fps! I found the same in the dashboard ;-)

found this, and it's really annoying:

== Next, write to us and we will deactivate your account. Please note that the deactivation we perform deactivates your individual Asana account and not your shared workspaces.

We don't yet provide a single action or button to delete your Asana account as we want to safeguard against unintended deletion. ==

from: http://help.asana.com/customer/portal/articles/204659-how-do...

found the Google page, not that easy

if anyone needs: https://www.google.com/dashboard click on "Websites authorised to access the account"

In your account settings (https://www.google.com/settings/), next to "Authorising applications & sites" there's an Edit link.