
There are various Tumblr photo viewers out there, but the Tumblr Mosaic Viewer is the best one I have come across so far. Here are some features:
- Mousing over each photo reveals a menu that allows you to go to the source page, visit the post page and reblog the photo
- Ability to create your own Favorite Lists
- Random Generator
- Endless scrolling (just keep pressing the space bar and new images will start loading)
- Two image size choices: 100 and 250
(via matthew buchanan)