What utilities assist in taking and annotating screen captures for local (clipboard) reuse? Is there any Mac utility that will allow me to:


Take a screen shot
Annotate it (arrows, text, etc)
Upload it somewhere
Put a link directly to the image on my clipboard (i.e., not to some Skitch sharing page or whatever)


Or, just as good, would be a utility that puts a screen shot in my Dropbox public folder and adds the appropriate URL to my clipboard. This is what Jing used to do, but it's being discontinued and it doesn't work very well on the retina MacBook Pro.
Pix.am! meets all your requirements. And since it's a lesser-known service, it has shorter URLs than services like droplr.com or Cloudapp.