Awesome Screenshot lets you:
Capture

• Capture or clip selected area, or all visible portion, or a window.
  
• Support PNG format
  

Annotate and Edit

• Annotate it with rectangles, circles, arrows, lines and text
  
• Crop and scroll and Show crop area dimension
  
• Use eraser to hide sensitive information
  

Save and Share

• Save to local
  
• One-click to upload to awesomescreenshot.com and get a shareable link
  

Version 1.2:

• Fixed some bugs