https://marco.org/2008/08/11/tumblr-staff-please-help-us-test-tumblr-v4
Please help us test Tumblr v4!
We’re getting ready to push our biggest interface overhaul since last November, and we’d love to get your feedback.
Nearly every piece of the interface has changed. We’ve tried to perfect the presentation of the Dashboard, and the retooled interface will enable a lot of the new functionality we’re prepping to launch.
It’s still early, so please let us know if anything seems funny.
You can access the beta at www.tumblr-beta.com.