How can I combine multiple screenshots in Skitch? With Skitch, I often find myself wanting to take screenshots of different parts of the screen, annotating them, and combining them into one image. I could use a separate program for this last step, such as Acorn, but is it possible to do this from within Skitch?
Nope, not possible within Skitch. 

The quickest workaround I've found to achieve that is using Keynote as a canvas, so you can combine the image in no time : 


open a new 'White' theme in Keynote
drag &amp; drop the 2 images from Skitch to Keynote
align the images in Keynote, resize, do some edits if necessary
take a snapshot with Skitch