One of the features that has been native in Tumblr for some time now is “post types”. An easy method of categorizing posts that results in them being displayed in an organized templated structure. Many have duplicated this in WordPress by using categories and then defining a theme specific to the special “post type” to create a by category display. Others have gone to some coding to solve the issue. In WordPress 3.1, now in beta, the WP team is adding “post types” called “post formats” and themes are already being written that take this into account. Will this result in a number of Tumblr users moving to WordPress given the other advantages of WordPress over Tumblr?
We have been moving Tumblr blogs to WordPress for a while now and expect we may see some more work.