This is a great addition, Tumblr is making great strides. The simplicity of Tumblr hasn’t gone away, but they’ve added powerful customization hidden within the advanced options.

staff:

More URL niceness

• We’ve added an advanced option to give an individual post a custom URL.

• If you don’t want Tumblr automatically adding a summary to your permalink URLs, you can now disable the option “Use descriptive URLs” on your Customize page.

  (Disqus users: Please do not adjust this setting just yet.)

• We’re also beginning to test an even nicer (!) URL format, inspired by the smart smart people at Vimeo. We’re hoping to drop the “/post/” label, and simply link to “http://www.davidslog.com/1029”. What do you think? You can check it out on Marco’s tumblelog.