InterMapper has a solution for monitoring instances of the popular Amazon cloud solution, ec2. Using InterMapper’s Cloud Monitor, you can monitor up to 5 virtual machines that are running for free. If you are just getting started and find that you would like some visibility into the performance of your ec2 instances then this solution is one that will allow you to get into the testing and management without having to incur a large expenditure.
And Cloud Monitor is build on top of Amazon’s Cloud Watch, meaning that it provides the most granular and up-to-date stats available for your instances, based on Amazon’s own tools. I’ve been finding that when you’re transitioning assets into ec2 that Cloud Monitor is a great tool to have at your disposal!