http://www.minecraftforum.net/topic/1081702-172-mineshot-15-huge-screenshot-capturing-reloaded/
Some notes:
1. The Settings GUI doesn't look like the screen shot any more, there is also nolonger an imageIO option for png files shift+9 still lets you set resolutions greater than your screen.
2. The camera controls are all done by the number pad (it is confusing at first)
3. Only works in single player