This small app provides an easy way to visualize your EC2 Instances and group them by different criteria. It shows just Instances for now, but more will come :)
Python (I use 2.7, might work on older) web.py (0.36, same disclaimer) Boto (2.6.0, same disclaimer)
Other that this, it uses the GraphDracula library, and jQuery.
You need to put your AWS key and AWS secret in a text file called settings.conf in this format
and place the file either in your Linux home directory or in the current directory from where you're running this.
After this, go to your ec2viz directory and type
python code.py 8080
Point your browser to http://:8080/static/view.html
(Takes a little while to load)