MARS Premium Theme
Earlier today MARS—the sixth Style Hatch Tumblr premium theme—went live. Like all the other themes this one is packed full of customization options (over 60) to select from the default, wide and columns layout, change the color scheme, upload background and logo images, integrate Typekit for complete control over the fonts, and much more.
One of my favorite features is the floating dates and tags in the default and wide layout modes. As you scroll down the date and tags intelligently float to the right. Notice how the date takes on the color of the post type.