TumbleOn is a good-looking new Tumblr streaming image viewer app for the iPad. The developers feel that images are the best part of Tumblr and their app focuses on optimizing Tumblr image viewing on the iPad.
Here’s a bit more background on it via the App Store page for the app:
Tumblr is a great social blogging service that encourages you and your friends to find great content and share it with each other. One of the best parts of Tumblr is the great images that people share.
With TumbleOn, and your Tumblr account, you can find and share great photos, right on your iPad.
With other Tumblr apps, you’re limited to just viewing your dashboard, or tediously finding the Tumblr blogs you like over and over again. TumbleOn makes exploring new content and revisiting your favorite Tumblr photo blogs easy.
With TumbleOn, you can view thousands of photos in minutes and find great content faster than in other apps.