- Jiffy (http://code.google.com/p/jiffy-web/)
- Episodes (http://stevesouders.com/episodes/) by Steve Sounders
- Boomerang (http://yahoo.github.com/boomerang/doc/) by Yahoo!
Have you used any of them or a similar too?
What did you use for the server-side? for reporting?
Is this a recommended approach?
If not, how should I monitor my web-site performance from the end-user's view?