Monitoring Cloud Computing Performance with PRTG: CPU, Disk, Memory Speed Comparison of Amazon EC2 Instance Types - From The CEO's Blog
http://www.paessler.com/blog/2009/04/06/prtg-7/monitoring-cloud-computing-performance-with-prtg-cpu-disk-memory-speed-comparison-of-amazon-ec2-instance-types/ Confirms what was noted elsewhere: EC2 small instance is not worth the money, it performs several times slower than medium or large instances