Marco.org

New Y Combinator startup Sad Trombone launched recently with what might be the simplest blogging platform to date. Yes, it’s even easier to use than Tumblr, which has a cult-following of users who like to post lots of pictures and short messages.

Here’s how you use Sad Trombone: push the “play!” button. You’re done.

Is this a lot like Tumblr? Yes, although the fast 0-step account registration is a great way to help this spread via mobile devices (you have to create an account on Tumblr’s website first, then you can start emailing to a unique email id). Sad Trombone also has a huge ad and Digg/Del.icio.us spam links, something Tumblr is just starting to roll out to zero users.

Another great thing about Sad Trombone - you can press the “play!” button as many times as you want to hear the “sad trombone” clip indefinitely (I wish Tumblr had that feature). If you choose to copy and paste the URL, you can also spam your friends and coworkers with Sad Trombone.

The services are otherwise somewhat similar.