simple boto script to list instances and some information about them.

instancelist.py

#!/usr/bin/env python

import boto
import os

ACCESS_KEY="<YOUR ACCESS KEY>"
SECRET_KEY="<YOUR SECRET KEY>"

ec2 = boto.connect_ec2(ACCESS_KEY, SECRET_KEY)

instances = ec2.get_all_instances()
i = 0
opts = {}
print "\nCurrently running instances:"
for r in instances:
   for inst in r.instances:
     opts[i] = (inst.id, inst.instance_type, inst.private_ip_address , inst.state, inst.launch_time)
     print "\t%d:" % i + " %s - %s - %s : %s (Running since: %s)" % opts[i]
     i += 1