How Shawn Blanc posts links from his iPhone and iPad?

Shawn Blanc, the deviser behind The Sweet Setup showing how he posts on his blog using Poster and x-callback-url:

The app I use is Poster, and unfortunately it’s no longer available for sale in the App Store. Thus I didn’t make a big deal out of how I use the app because I assumed many people wouldn’t be able to make use of such nerdy information. But, based on the feedback I’ve been getting lately, perhaps I was wrong.

I never used Poster, but I bet it is missed on the App Store. Even if you don’t have the app, Shawn has some great tips on Instapaper, Drafts and Mr. Reader to anyone who links to third-party pieces on their blogs or just want to check this interesting side of Shawn.