Last month StumbleUpon unleashed Lists, a Pinterest-like element hat allowed users to create lists of webpages. This was a Beta release and part of a new, improved StumbleUpon.
Since the Beta launch, the new features have taken off at a torrid pace. 45,000 StumbleUpon lists have been created, everything from Caligraphy to Waffle Raffle.The color-coded StumbleDNA makes it easy to decipher what category a webpage belongs to, and users can follow along with a List to keep up with new content.
Seeing the overwhelming success, StumbleUpon is removing the Beta off of the new features and is bringing to all users. Lists have also been integrated into the StumbleBars browsers for Chrome and Firefox. Look for the new functionality to roll out to all shortly.
For more information see the official StumbleUpon blog post.