I started a project on Google Code to create a set of Python tools to make dealing with Round Robin Databases (RRD) less painful. Setting up RRD's can be tough if you don't know what you are doing.
anyone interested can check it out here: rrdpy
I used it to create a simple HTTP monitoring script (included in source) to graph web response latency like this:
Copyright © 2006-2008 Corey Goldberg
Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.