This is the Effector Theme (v1.2.3) by Carlo Franco. For more information about this theme, visit: http://goo.gl/zjFTX You can also follow: @effectortheme on Twitter for updates!
Effector has some features that differ from the theme I used to use. I'll point out some of the differences in the paragraphs that follow.
My primary reason for switching was to take advantage of the 700
pixel layout size. The vast majority of my posts are images and
they look much better at this larger size. The bad news, however, is that smaller images are enlarged to 700 pixels and don't looks so good. Fortunately, you can click on the pop-up full-size icon in the upper right corner of the image and see it in the smaller size. Effector
supports slider photosets, so look for the navigation bars on either
side of photos since I occasionally post multiple photos with a single post
The vast majority of my posts are photos. A quick way to see all of my photo posts is Tumview. Using Tumview, you can see a grid of photos on the left side of your browser. Clicking on a photo will bring up the corresponding post on the right side of your browser.
If you click on the Archive icon at the top of tjhe page, The archive icon resembles a clock with a circular arrow surrounding it. If you mouse over the icon the "Archive" tool-tip will appear. In the archive view, all of my posts will be displayed in a grid view by month and day. Clicking on a post thumbnail will open the full post it represents.
I have not added comments to the new theme. I have had some experience with Disqus and I find that the Tumblr question feature largely supplants the need for comments.
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