I mentioned an update to Acorn yesterday, which got me to poking around with the app. I noticed the release notes had something about Flickr Export moving from one menu to another, but I couldn't find it. I turned to Google and quickly found the Flickr Export Plugin for Acorn by Coding Robots. This free plugin, pictured above, lets you export a picture from Acorn directly to Flickr, Yahoo!'s photo sharing site. It also lets you tag your picture, set a title and description, and tell Flickr who can view your photo.
Not too shabby for a free plugin.